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{{FA}}
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{{character-infobox
{{about|the character debuting in ''[[Luigi's Mansion]]''|his ''[[Super Mario Sunshine]]'' counterpart|[[Big Boo (character)]]}}
|image = [[Image:KingBoo.jpg|250px]] <br> '''King Boo'''
{{character infobox
|full_name = King Boo
|image=[[File:Mario Party Star Rush King Boo.png|250px]]<br>Artwork from ''[[Mario Party: Star Rush]]''
|first_appearance = ''[[Luigi's Mansion]]''
<!--DO NOT CHANGE THIS TO HIS LUIGI'S MANSION 3 ARTWORK. Please see "Template:character infobox" for more information.-->
|species = [[Boo]]
|first_appearance=''[[Luigi's Mansion]]'' ([[List of games by date#2001|2001]])
|affiliation = [[Koopa Troop]], [[Boo|Boos]]
|species=[[Boo]]
|latest_appearance = ''[[Mario Super Sluggers]]''
|latest_appearance=''[[Super Mario Bros. Wonder]]'' ([[List of games by date#2023|2023]])
}}
}}
{{quote|I am not afraid of [[Luigi|you]], fool! I fear only that infernal [[Poltergust 3000]] you carry on your back! Stupid machine! But I am a KING among [[Boo]]s! I swear it... I shall fear no mere house-cleaning device!!|King Boo|Luigi's Mansion}}
'''King Boo''' is the leader of the [[Boo]]s and [[Ghost (Luigi's Mansion series)|ghosts]], the main antagonist of the [[Luigi's Mansion (series)|''Luigi's Mansion'' series]], and the arch-nemesis of [[Luigi]]. He is also an ally of [[Bowser]] and has aided him in his various schemes. He has succeeded in capturing [[Mario]] in the ''Luigi's Mansion'' games, as well as capturing [[Toad (species)|Toad]]s, [[Professor E. Gadd]], and [[Princess Peach]]. Although not the [[Boohemoth|biggest Boo]], King Boo has some powers throughout the series, including materializing objects and spitting fire. King Boo's power is often directly proportional to the number of Boos in his vicinity.


{{quote|Seriously, who would believe that mansions get given away in contests? Talk about stupid! What do they feed you Mario Brothers, anyway? Gullible soup?|King Boo|Luigi's Mansion}}
==History==
===''Luigi's Mansion'' series===
====''Luigi's Mansion''====
{{LM portrait infobox
|image=KingBooGold.png
|width=200px
|full_name=Bowser and King Boo, the Dastardly Duo (GameCube){{ref needed}}<br>King of Boos (3DS)
|age=Unknown
|biography=Nothing is known about this mysterious entity. (GameCube){{ref needed}}<br>
The giant Boo adorned with a crown. It's hard at work on other evil plans involving the other Boos. (Nintendo 3DS)
|room=[[Roof (Luigi's Mansion)|Roof]]/[[Secret Altar]]
|hp=500
}}
[[File:KingBoowser.jpg|thumb|upright=1.1|left|''Luigi's Mansion'' artwork of King Boo escaping from his Bowser suit]]
Prior to the events of ''[[Luigi's Mansion]]'' and its [[Luigi's Mansion (Nintendo 3DS)|remake]], Professor E. Gadd captured [[Boolossus]] in a portrait, using a device called a [[Ghost Portrificationizer]]. He later hung Boolossus's portrait to his Gallery inside [[Professor Elvin Gadd's Lab|his lab]] in [[Boo Woods]]. This angered King Boo, so he devised a plan to rescue Boolossus.
 
King Boo and his forces attacked the laboratory. The Boos reversed the settings of the Portificationizer and released Boolossus. King Boo then ordered that all the ghosts that E. Gadd had captured should be released as well. After releasing all the portrait ghosts, King Boo created a [[Luigi's Mansion (location)|huge mansion]] and placed it next to the professor's lab. King Boo, his Boo minions, and the recently freed portrait ghosts decided to inhabit the mansion. With a huge mansion and an army of ghosts, King Boo decided to exact revenge upon Mario and Luigi for all the Boos they attacked during their adventures by capturing them.


'''King Boo''' is the leader of the [[Boos]] and the main antagonist of the game ''[[Luigi's Mansion]]''. He is also an ally of [[Bowser]], King of the [[Koopa Troopa|Koopas]], and has aided the Koopa leader in his various schemes. He first appeared as [[Luigi]]'s nemesis, and is more than capable of devising and enacting villainous plans by himself, including his capture and imprisonment of the hero [[Mario]]. Although not the biggest Boo in the [[Mushroom World|world]], King Boo has abilities that far surpass that of the average ghost, and wields a number of impressive magical abilities, including the ability to materialize objects out of thin air. King Boo's magical power is directly proportional to the number of Boos in his vicinity.
Hoping to capture Luigi, King Boo sends him a letter. The message states that Luigi has won a mansion in a contest and provides the location of the prize. Luigi asks his brother Mario to investigate the mansion and says that he is arriving shortly thereafter. Mario travels to the mansion, but right after he enters, he is instantly overwhelmed by King Boo's forces and captured. King Boo then imprisons Mario in a portrait, and places him in the [[Secret Altar]], located in the basement of the mansion.


==History==
While waiting for Luigi, King Boo and his Boo minions wait behind a secret door in the floor of the [[Storage Room (Luigi's Mansion)|Storage Room]]. When Luigi enters the room and reveals the secret door, the Boos spring out from the floor. However, the Boos (including King Boo) stop their surprise attack when they notice the [[Poltergust 3000]] on Luigi's back, which he had been given from E. Gadd in order to recapture the Portrait ghosts and save his brother. In fear of the device, King Boo and the other Boos scatter and hide in the mansion. King Boo travels to the Secret Altar in the mansion's basement.
===''Luigi's Mansion''===
Prior to the events of ''Luigi's Mansion'', the ghost hunter [[Professor E. Gadd]] managed to capture [[Boolossus]], one of the biggest and strongest Boos in King Boo's forces. Of course, this greatly angered the Boo leader, and the ghost orchestrated a rescue attempt. Professor E. Gadd had brought Boolossus to [[Professor E. Gadd's Lab|his lab]] in [[Boo Woods]]. Using a special device called a [[Portrificationizer]], E. Gadd sealed Boolossus in a portrait and hung the new piece of art in his Gallery.


Eventually, King Boo and his forces attacked the laboratory. The Boos reversed the settings of the Portificationizer and released Boolossus from his portrait prison. King Boo, in an act of revenge, then ordered that all the ghosts that E. Gadd had captured in his travels should be freed as well. After releasing all of the portrait ghosts and reversing years and years of E. Gadd's work, King Boo magically created a [[Luigi's Mansion (place)|huge mansion]] out of thin air, and placed it right next to the professor's lab. The Boo leader, his Boo minions, and the portrait ghosts recently freed from their prisons, decided to inhabit the mansion. With a new place to haunt and an army of new ghosts courtesy of released portrait ghost [[Vincent Van Gore]], King Boo decided to enact a new scheme. With his newfound resources, King Boo created a plan of revenge against old rivals of the Boos. King Boo devised a plan to capture both Mario and Luigi, the defenders of the [[Mushroom Kingdom]].
The special key that [[Vincent Van Gore]] holds unlocks the path to the Secret Altar. However, he is locked in [[The Artist's Studio]] on the third floor of the mansion. After capturing him and retrieving the key, Luigi discovers that he still cannot enter the Secret Altar. If Luigi attempts to enter the Secret Altar without catching a certain number of Boos, King Boo blows Luigi to the [[Foyer (Luigi's Mansion)|Foyer]], the entrance of the mansion. Since King Boo's power is related to the number of Boos in the mansion, Luigi can weaken him by capturing the Boos hidden in various rooms. After Luigi captures at least forty of the mansion's fifty Boos, King Boo loses his ability to blow Luigi from the Secret Altar. Once King Boo is weakened, Luigi enters King Boo's Secret Altar.


Hoping to recapture Luigi, King Boo sent the plumber a letter. The message stated that Luigi had won a mansion in a contest and provided the location of the prize. Of course, Luigi was skeptical of such a reward, as he did not recall entering any contest; however, he was excited nonetheless. He asked his brother Mario to investigate the mansion, and said he would arrive shortly thereafter. As such, Mario, along with a few [[Toad (species)|Toads]], ventured to the mansion. Unfortunately, Mario was instantly overwhelmed by King Boo's forces and was captured. King Boo then imprisoned the great hero of the Mushroom Kingdom in a portrait, just like the Boo leader's minion Boolossus was previously. The imprisoned Mario was placed in the [[Secret Altar]] in the basement of the mansion. Of course, King Boo wished to add another painting to his collection: the portrait of Luigi.
[[File:LM 3DS Bowser King Boo.png|thumb|left|King Boo's boss fight in the 3DS remake]]
Upon entering the Altar, Luigi notices King Boo staring at Mario in the painting while insulting the brothers' intelligence for having fallen for his scheme. King Boo then turns around to face Luigi and states his desire to add a Luigi painting to the collection. After this, King Boo flies into the Mario painting hanging on the wall. The picture of Mario transforms into Bowser, then the new Bowser painting inhales Luigi into the canvas, transporting Luigi into an arena that resembles the mansion's [[Roof (Luigi's Mansion)|roof]]. Luigi then confronts Bowser. In reality, this is a suit of Bowser that King Boo controls from the inside and uses as a shield.


While waiting for the arrival of Luigi, King Boo and his Boo minions decided to rest behind a secret door in the floor of the [[Storage Room]]. When Luigi arrived in the room, and revealed the secret door, the Boos sprang out from the floor, enraged after being awakened from their slumber. However, the Boos (including King Boo) broke off their surprise attack when they noticed the [[Poltergust 3000]] on Luigi's back. The special ghost-capturing weapon was previously given to Luigi by Professor E. Gadd, who wanted the plumber to recapture the portrait ghosts. The Poltergust 3000 was one of the few things King Boo feared, and he, along with the other Boos, flew off in different directions and hid in the mansion. The Boo leader himself traveled to the [[Secret Altar]] in the mansion's basement. While in the protected room, King Boo amused himself by watching Mario's pathetic pleas for help.
King Boo uses this Bowser suit to attack Luigi, shooting flames at him causing ten HP of damage, and even attempting to inhale him into its mouth, deducting fifteen HP upon spitting him out. The suit also has the ability to create three large spiked bombs and toss them at Luigi, which when exploding, take away ten HP. Luigi can use his Poltergust 3000 to grab one of the spiked explosives and release it into the Bowser suit's mouth. This attack blasts the head off of the Bowser suit, causing King Boo to exit the shield and expose himself to the Poltergust 3000. Luigi begins to deplete the ghost's five hundred hit points. Meanwhile, the suit's head hovers around the arena, shooting icy blasts at Luigi, which freezes him briefly. King Boo, after a while, flies back into the dormant Bowser body and the head reattaches itself, resuming the fight. Luigi repeats this process, slowly weakening King Boo, but after King Boo's life falls below two hundred HP, the head of the suit reattaches backwards whenever he returns to the Bowser body, causing the Bowser suit to run around aimlessly. The suit soon corrects its head and resumes the fight. Eventually, Luigi manages to completely drain King Boo's HP and capture him inside the Poltergust 3000.


The path to the Secret Altar was locked by a special key in the possession of Vincent Van Gore, who had locked himself in [[the Artist's Studio]] on the third floor of the mansion. After capturing the ghost and retrieving the key, Luigi discovered that he needed more than a key to access King Boo's lair. If the green-clad ghost hunter attempted to enter the Secret Altar without catching a certain number of Boos, King Boo himself would materialize before Luigi and blow the plumber away to the [[Foyer]], the entrance of the mansion. However, since King Boo's power was directly related to the number of Boos in the mansion, Luigi could weaken the Boo leader by capturing the Boos hidden in the various rooms. After Luigi captured at least forty of the mansion's fifty Boos, King Boo lost his ability to blow the ghost hunter away from the Secret Altar. As such, with his Poltergust 3000 in hand, Luigi entered King Boo's lair and prepared for a final showdown.
In the 3DS remake, hearts appear when the Bowser suit destroys a pillar, increasing the chance of getting a gold frame (platinum in Hidden Mansion). However, they do not appear in Boss Rush mode.  


{{portrait-infobox
After the battle, Luigi receives King Boo's crown, worth 5000G, and adds it to his treasure collection. Upon returning to the mansion, Luigi quickly travels to Professor E. Gadd's lab. In the lab, Luigi connects the Poltergust to the professor's Portrificationizer, dumping its contents into the machine. Both King Boo and the fake Bowser appear on the Portificationizer portrait. With King Boo captured, Professor E. Gadd hangs [[Portrait ghost|his new portrait]] in an empty room in his gallery.
|image=Kingboo2.jpg
{{br}}
|width=200px
|fullname=Bowser and King Boo, the Dastardly Duo
|age=Unknown
|biography=Nothing is known about this mysterious entity.
|room=Roof/Secret Altar
|hp=500
}}
Upon entering the altar, Luigi noticed King Boo staring at his most prized possession: the Mario painting. However, King Boo turned to Luigi and stated his desire to complete his set and add a Luigi painting to the collection. After saying this, King Boo flew into the Mario painting hanging on the wall. Strangely, the figure of Mario transformed into the form of Bowser, and the new Bowser painting inhaled Luigi into the canvas. After entering the painting, Luigi was transported into a strange arena that resembled the mansion's [[roof]]. The green-clad hero was in for an even bigger shock when none other than the colossal form of Bowser appeared before him. In reality, King Boo was inside the hulking beast, secretly controlling the Bowser "disguise" from behind the scenes.


King Boo used this Bowser disguise to attack the heroic Luigi, shooting flames at the green-clad plumber, and even attempting to inhale Luigi into his mouth. The beast also possessed the ability to create three large spiked bombs out of thin air, and toss the explosives at Luigi. The hero knew he had to fight back, and used his Poltergust 3000 to pull in one of the spiked explosives and release it into the beast's mouth. The result of this attack blasted off the head of the Bowser costume, knocking King Boo out of Bowser's body. Exposed to the power of the Poltergust 3000, Luigi began to deplete the ghost's five hundred hit points. Unfortunately, Bowser's head would hover around the arena and shoot ice blasts at Luigi. If frozen, Luigi could shake himself free from the icy prison. He would have to be quick, as he took damage every second he was frozen. Eventually, King Boo would fly back into the dormant Bowser body and the head would reattach itself. Resuming the fight. Luigi repeated the same process, slowly weakening the ghost, but after King Boo's life fell below two hundred HP, the head of the costume would reattach backwards whenever he returned to the Bowser body, causing the Bowser disguise to run around aimlessly, destroying everything in its path. Eventually, the Bowser body would put its head on correctly and resume the fight.
====''Luigi's Mansion: Dark Moon'' / ''Luigi's Mansion 2 HD''====
[[File:King Boo Artwork - Luigi's Mansion Dark Moon.png|thumb|Artwork depicting King Boo's redesigned appearance for ''Luigi's Mansion: Dark Moon'']]
King Boo reappears in ''[[Luigi's Mansion: Dark Moon]]'' as the main antagonist and final boss once more. He looks similar to his original appearance from ''Luigi's Mansion'', but he retains the full set of teeth and sped-up voice he had in his appearances in the other ''Super Mario'' titles and is also much larger. He has a purple tongue and mouth and glowing purple eyes, and the dark area around his eyes is bigger and darker.


After a long and difficult battle, Luigi managed to completely drain King Boo's HP and capture the ghost leader inside the Poltergust 3000. Without the presence of King Boo, the Bowser disguise collapsed lifelessly onto the ground.
It is revealed later in the game that [[Professor E. Gadd]] had sold the portrait of King Boo from ''[[Luigi's Mansion]]'' at a garage sale (a car boot sale in British English versions), which is how the king escaped. King Boo shatters the [[Dark Moon]] into six pieces with a bolt of energy from his crown, which contained a power-enhancing gem. This turns the once-friendly ghosts of [[Evershade Valley]] hostile and mischievous as well as sprawling the Dark Moon's pieces to each Mansion of the valley, which Luigi has to recover.  


After the battle, Luigi picked up King Boo's crown, worth 5000G (the value of only one [[Gold Coin]]) and added it to his treasure collection. Upon returning to the mansion, the green-clad ghost hunter also picked up the Mario painting and quickly traveled back to Professor E. Gadd's lab. In the lab, Luigi connected the Poltergust to the professor's Portrificationizer, dumping its ghostly contents into the machine. Surprisingly, not only did the spirit of King Boo appear in the Portrificationizer, but what appeared to be the Bowser disguise also materialized. With King Boo captured and imprisoned, Professor E. Gadd hung his new portrait in the most elegant room of his gallery. In the end, Mario was finally released from his portrait and Luigi emerged from his adventure a true hero.
Towards the end of the game, it is revealed that King Boo has captured Mario like he did in the last game. After Luigi obtains the last Dark Moon piece and returns to the [[Bunker]], King Boo captures him and pulls him back into [[??? (Luigi's Mansion: Dark Moon)|his dimension]]. He reveals to Luigi he escaped from the painting and broke the Dark Moon, causing the ghosts to become under his control. He intends to use the ghosts as an army to conquer both Evershade Valley and the [[Mushroom Kingdom]] while also planning to put Luigi, E. Gadd, and all their friends into paintings for revenge. He then engages into battle with Luigi.


===''Super Mario'' series===
During the final battle, King Boo summons a series of magic lightning bolts with his crown and will attempt to slam Luigi with his body. The latter causes [[Spike Ball|spiked ball]]s to fall from above, which will roll around the tilting platform to pose a hazard. King Boo will stop moving when looked at, and when caught underneath a falling ball he will become stunned, leaving him vulnerable to the [[Poltergust 5000]]. Once his HP is depleted and he gets sucked into the Poltergust 5000, he immediately breaks out and sends Luigi into a floating hallway. He then swells to a large size and begins rolling after Luigi, attempting to stall Luigi with various obstacles, such as falling shelves and suits of armor with large polearms. If King Boo does hit Luigi, he'll pause for a moment to laugh maliciously. Once Luigi makes it out of the hall, he will land on another tilting platform, where King Boo will repeat his previous patterns at a higher intensity. The battle concludes after the third battle and second hallway chase, leading to King Boo's defeat and being sucked into the Poltergust 5000.
====''Super Mario Sunshine''====
[[Image:KingbooSunshine.jpg|thumb|left|King Boo, as he appears in ''[[Super Mario Sunshine]]''.]]
During the events of ''[[Super Mario Sunshine]]'', Bowser and his forces attacked the vacation paradise of [[Isle Delfino]], home of the [[Piantas]]. King Boo (Boss Teresa in Japan, indicating he may be another character, may have lost his royalty status temporarily, or is just a uniform title to fit with the rest of the bosses' Japanese names) and his Boo minions occupied [[Hotel Delfino]], the four-star resort located on [[Sirena Beach]]. While [[Bowser Jr.]], in the guise of [[Shadow Mario]], tarnished the real Mario's good name, King Boo settled into his new house of haunts. The Boo leader and his forces even managed to capture a few [[Shine Sprites]], the source of Isle Delfino's energy. In fact, King Boo personally guarded one of these Shine Sprites.


As his Boo minions roamed the halls of the hotel, King Boo decided to make his lair inside a secret area of the hotel's [[casino]]. Ultimately, King Boo's control over the hotel would not last long. Mario, armed with his new accessory [[F.L.U.D.D]], fought past King Boo's forces and discovered the entrance to the ghost leader's hidden lair. To enter the secret area, Mario had to [[Ground Pound]] the purple space on the giant roulette in the center of the casino. This transported the heroic plumber to King Boo's arena, where the two engaged in combat.
====''Luigi's Mansion Arcade''====
King Boo is the final boss for ''[[Luigi's Mansion Arcade]]'', leading his ghosts in an uprising to get revenge on Luigi and Professor E. Gadd. However, after Luigi has sucked in all of his minions with the [[Poltergust 5000]], King Boo assaults Luigi on the [[Terrace (Luigi's Mansion: Dark Moon)|terrace]] of the [[Treacherous Mansion]]. Protected by a magical barrier, he can only be attacked once he lets his guard down. King Boo throws bombs at the player, moves very quickly and clones himself multiple times over the course of the fight. However, only the original has the power-enhancing gem on his crown. Just like in ''Luigi's Mansion: Dark Moon'', he escapes the Poltergust 5000 two times before being defeated for good.


The battle took place on top of yet another giant roulette. During the fight, King Boo would attack Mario by spitting normal Boos to do their master's dirty work. The ghoul would also spit bubbles at the plumber, although Mario could simply pop these to refill F.L.U.D.D's water tank. However, the ghastly leader would also spice up the battle by taking out a large slot machine. When Mario sprayed the slot machine while King Boo was holding the device, the reels would begin to spin. If three question marks lined up, [[enemies]] would appear out of nowhere and instantly attack the heroic plumber. If three [[coins]] appeared on the reels, Mario would be rewarded with coins (and could thus refill his health meter). Finally, if three fruits lined up on the reels, a heaping amount of [[fruit]] would appear on the roulette battlefield. Noticing King Boo's large, drooling tongue hanging out, Mario decided to pick up a red [[pepper]] (when available) and tossed the spicy fruit into the massive tongue. This would set the ghost royal's mouth ablaze, immobilizing the large Boo as he attempted to put out the fire. Mario could then toss another fruit directly at King Boo to deliver damage to the ghost. However, if Mario sprayed King Boo instead of hitting him with a fruit, F.L.U.D.D's water would cool the ghost's tongue and the Boo leader would suffer no damage. After repeating the process of red pepper attack followed by a fruit strike three times, Mario defeated the King of the Boos and collected the ghost's personal Shine Sprite. With more energy returning to the island, Mario continued to collect more Shine Sprites, and eventually defeated both Bowser and his son Bowser Jr.
====''Luigi's Mansion 3''====
[[File:LM3 E3 screen 04.png|thumb|left|King Boo chasing Luigi down a hallway in ''Luigi's Mansion 3'']]
King Boo reappears in ''[[Luigi's Mansion 3]]'' with the same design as in ''Luigi's Mansion: Dark Moon'', but with more detail on his crown and a more expressive scowl. King Boo is one of the two main antagonists, having been released by the other main antagonist [[Hellen Gravely]], the owner of [[The Last Resort]] hotel and a big fan of his, in order to impress him. Seeking revenge on Luigi for his previous defeats, he traps Professor E. Gadd, Mario, [[Princess Peach]], and the three [[Toad (species)|Toads]] in portraits before going after Luigi, who manages to escape his capture by going down a laundry chute. He later ends up entrusting Hellen Gravely with Mario's portrait, although it's implied that he intended for Luigi to win both due to Gravely's failures by that time and so he could capture both alongside Peach by using the latter as bait, also recapturing the Toads and Professor E. Gadd just after Mario was freed. However, he ultimately fails to capture Luigi atop the hotel due to [[Polterpup]] shoving him out of the way of King Boo's portrait, and then proceeds to battle Luigi. To defeat King Boo, Luigi must throw a bomb from a spiked ball King Boo throws into his mouth, then pull on his tongue with [[Gooigi]]'s help and slam him repeatedly. Upon doing so, King Boo will then generate a clone that attacks alongside him. After this is done twice, King Boo will enlarge the painting, and Luigi will then have four minutes to attack King Boo one last time. The battle ends with King Boo being recaptured by Luigi and placed in a containment jar alongside Gravely, much to his frustration. As the purple gem in his crown was taken by Luigi after the final battle, it is missing from his crown.<ref>{{cite|author=ProsafiaGaming|date=October 30, 2019|url=youtu.be/GYyMEi0iTZw?t=643|title=Luigi's Mansion 3 - All Endings & Ranks + Credits|publisher=YouTube|accessdate=November 20, 2019}}</ref>


====''Super Mario 64 DS''====
The clones that King Boo summons in the final battle reference his original design from ''Luigi's Mansion'', as they only have two teeth, lacking the middle two fangs King Boo is depicted with now.
[[Image:BigBoo.jpg|thumb|right|King Boo as encountered in ''[[Super Mario 64 DS]]''.]]
King Boo appeared in the ''[[Super Mario 64]]'' remake, ''[[Super Mario 64 DS]]''. As the boss who locked [[Luigi]], he infested [[Princess Peach's Castle]] and wore a large crown and had a distinct cackle - the same laugh that would be heard later when Luigi faced the Boo leader during the events of ''Luigi's Mansion''. However, when the game was translated to English, the King was given the incorrect title, [[Big Boo]]. In ''[[Mario Kart DS]]'', this exact same enemy returned along with some other ''Super Mario 64 DS'' bosses. It was given the proper name of King Boo, as he was in the Japanese version.


Regardless, this Big Boo aided Bowser in his conquest of Peach's Castle by capturing Luigi and imprisoning him in [[Big Boo's Haunt]]. Specifically, the green-clad plumber was imprisoned behind a painting of himself inside the haunted mansion. Mario eventually fought King Boo in an effort to free Luigi. To defeat the ghost leader, Mario had to follow King Boo's movements in the arena's mirrors then [[stomp]] the ghoul when he came too close. Ultimately, [[Mario]] saved his brother from King Boo's clutches and together (along with [[Yoshi (character)|Yoshi]] and [[Wario]]) they defeated Bowser and saved [[Princess Peach]].
If the player gets a game over at any point during this game, King Boo will be shown trapping Luigi in a portrait alongside the rest of his friends.


This may have been Mario's first encounter with King Boo, as the remake of Super Mario 64 would logically take place at the same time, and take its place in the game chronology.
===''Super Mario-kun''===
[[File:KingBoo SuperMarioKun.jpg|thumb|A depiction of King Boo in ''Super Mario-kun'']]
King Boo appears in a short chapter on ''Luigi's Mansion'' of volume 26 of ''[[Super Mario-kun]]''. As in the game, Luigi reveals King Boo by knocking off the Bowser illusion's head. Unlike in the games, however, King Boo is immediately sucked in.


===[[Mario Kart (series)|''Mario Kart'' series]]===
===''Mario Kart'' series===
====''Mario Kart: Double Dash!!''====
====''Mario Kart: Double Dash!!''====
[[Image:Peteyboo.jpeg|left|thumb|King Boo and [[Petey Piranha]] in ''Mario Kart: Double Dash!!'']]
[[File:Petey Piranha and King Boo - Mario Kart Double Dash.png|left|thumb|175px|King Boo and Petey Piranha are partnered racers in ''Mario Kart: Double Dash!!'']]
King Boo was an unlockable character in the racing game ''[[Mario Kart: Double Dash!!]]'' Despite being a ghost, King [[Boo]] was classified as a heavyweight driver. His partner was [[Petey Piranha]], and both had the ability to use any other character's special item (if they were going to get a special, it would be randomly chosen). Of course, this means they possessed no unique special item of their own.
King Boo is an unlockable character in ''[[Mario Kart: Double Dash!!]]'', marking his first playable appearance. He is partnered with [[Petey Piranha]], and both are unlocked by winning the [[Star Cup]] in Mirror Mode. His large size makes him a heavyweight driver, despite King Boo being a ghost. He and Petey Piranha can use almost any other character's [[Special Item (Mario Kart series)|Special Item]], barring the [[Green Fireball]] or the [[Birdo's Egg]]. The special item they obtain depends on their current position in the race. King Boo's personal kart is the [[Boo Pipes]], which is a gray version of Petey's [[Piranha Pipes]] kart, but with an image of a Boo instead of a Piranha Plant where the item-using partner stands. Additionally, it notably has a low speed stat and high acceleration stat, in contrast with the other heavyweight karts in the game. King Boo appears to slightly shrink when he becomes the driver. On the second "Thanks for Playing!" screen, King Boo appears in the background chasing [[Wario]] and [[Waluigi]].
 
In the {{media link|MarioKartDoubleDashDebugMenuBossTeresa.png|debug menu}} found in the demos and debug build of the game, King Boo is referred to as "Boss Teresa", the Japanese name used for the [[Big Boo (character)|Big Boo]] boss from ''[[Super Mario 64]]'' and ''[[Super Mario Sunshine]]'', instead of his usual name "King Teresa".


====''Mario Kart DS''====
====''Mario Kart DS''====
In the game ''[[Mario Kart DS]]'', King Boo battled against [[Princess Peach]], adopting a much deeper and sinister laugh than the average Boo. As Peach, driving in her [[kart]], attempted to collect fifty [[coins]] on the [[Lava Arena]], King Boo would circle around and attack the princess, stealing some of her coins. To steal them back, Peach had to drive into King Boo. After collecting fifty coins, King Boo would admit defeat and Peach would win the battle.
In ''[[Mario Kart DS]]'', King Boo, along with six other bosses from ''Super Mario 64 DS'', re-appears as one of the bosses of the Mission Mode. King Boo is the boss of the fourth level, with the playable character being [[Princess Peach|Peach]]. Peach attempts to collect 50 [[coin]]s on the [[Lava Arena]] within the time limit, but after a few seconds King Boo appears, surrounds her, and then attacks her, stealing ten of her coins and making all uncollected coins disappear, before teleporting to another area of the arena. To take them back, Peach has to drive and bump into King Boo, making him transparent. Then, she can drive through him again, retrieving her coins and making the other coins reappear. However, King Boo soon reappears a few moments later to get the coins again. After collecting all fifty coins, Peach finally defeats King Boo. Additionally, the [[Bowser]] and King Boo painting from ''[[Luigi's Mansion]]'' appears in the [[DS Luigi's Mansion|Luigi's Mansion]] race course, although only Bowser can be seen in the painting.
 
====''Mario Kart Arcade GP 2''====
A large picture of King Boo appears near the end of the [[Yoshi Park 2]] course in ''[[Mario Kart Arcade GP 2]]'', where it inhales many ghosts and the racers. As the player drives into his mouth, they are warped back to the beginning of the course.


====''Mario Kart Wii''====
====''Mario Kart Wii''====
King Boo returns in ''[[Mario Kart Wii]]'' as a heavy weight driver, and is unlocked by completing the [[Star Cup]] in 50cc.
[[File:MKW SNES Ghost Valley 2 Screenshot 2.png|thumb|left|King Boo in ''Mario Kart Wii'']]
King Boo returns in ''[[Mario Kart Wii]]'' as a large-sized driver, and is unlocked by completing the [[Star Cup]] in 50cc. He is also unlocked by playing 750 races. He features a good handling bonus and a small off-road bonus, which comes in handy for vehicles like the [[Offroader]], [[Wario Bike]], and [[Phantom (bike)|Phantom]]. He is used as the Staff Ghost on the {{classic-link|SNES|Ghost Valley 2}} course. In the credits, he appears driving the [[Jetsetter]] on the {{classic|SNES|Ghost Valley 2}} course.
 
King Boo is one of the few characters to have his standing animation on the character select screen altered from ''Mario Kart: Double Dash!!'' In this case, his tongue is not sticking out of his mouth the whole time like before; now, before selecting him, his tongue is still in his mouth. Other characters whose poses were altered include: [[Yoshi]], who is now looking at the screen; [[Birdo]], whose bow was made larger; [[Diddy Kong]], who is looking in a different direction; Wario, who now has short sleeves; Waluigi, who now performs a slightly different animation when selected; and [[Donkey Kong]], whose mouth is not as wide open and is looking in another direction.
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====''Mario Kart 8 Deluxe''====
[[File:MK8D King Boo Battle Mode Screenshot.png|thumb|King Boo in ''Mario Kart 8 Deluxe'', wearing a crown from [[Battle Mode]]]]
King Boo returns as a playable character in ''[[Mario Kart 8 Deluxe]]'', the enhanced port of ''[[Mario Kart 8]]'' released for [[Nintendo Switch]]. He is among the lightest of the five heavyweight groups, sharing his statistics with [[Rosalina]], [[Link]], and [[Pauline]]. He has the lowest top speed and weight of all the heavyweights, all while sharing similar acceleration as other heavy groups. However, his handling is amongst the best of the heavyweights (shared with the [[Metal Mario|metal]] [[Pink Gold Peach|characters]] and Petey Piranha). He also has the strongest mini-turbo boost of the heavyweights. Finally, his traction stat is noticeably strong, being far and away the best in his weight class, and the third best base traction stat in the game. Additionally, his horn sound is the sound that [[Big Boo (character)|King Boo]] from ''[[Super Mario Sunshine]]'' makes when hit by a [[pepper]]. He is the 150cc Staff Ghost for {{classic-link|GBA|Boo Lake}} and the 200cc Staff Ghost for three courses: [[Twisted Mansion]], {{classic-link|GBA|Snow Land}}, and {{classic-link|3DS|Rosalina's Ice World}}. Initially, King Boo did not have a [[rival]] character for Grand Prix mode, but upon release of Wave 5 of the ''[[Mario Kart 8 Deluxe – Booster Course Pass|Booster Course Pass]]'' DLC, King Boo was given a rival in the form of [[Petey Piranha]] and also became Petey's rival, likely a nod to their status as partners in ''[[Mario Kart: Double Dash!!]]'' Because of this, he is the only base game character to gain a rival through the ''Booster Course Pass''.
 
====''Mario Kart Arcade GP DX''====
King Boo appears as a featherweight playable character in ''[[Mario Kart Arcade GP DX]]'', sharing his stats with [[Baby Mario]] and [[Baby Peach]]. He was originally only playable during a limited-time event campaign held between October 18, 2017, and January 10, 2018, in the Japanese version, though Bana Passport users could unlock King Boo permanently when they collected three in-game stamps, making him usable even after the event's duration. In an update released on October 10, 2018, he was made available for players who did not participate in the aforementioned event.
 
====''Mario Kart Tour''====
[[File:MKT King Boo Luigi's Mansion.jpg|thumb|left|170px|King Boo (Luigi's Mansion) in ''Mario Kart Tour'']]
King Boo reappears as a playable character in ''[[Mario Kart Tour]]'', available as of the 2019 [[Halloween Tour (2019)|Halloween Tour]]. He is classified as a Super driver, and his [[Special skill (Mario Kart Tour)|special skill]] is the [[Lucky Seven]].
 
The game also features two other playable variants of King Boo. '''King Boo (Luigi's Mansion)''', also introduced to the game in the 2019 Halloween Tour, uses his design from ''Luigi's Mansion 3'', marking the first time King Boo is playable using his appearance from the ''Luigi's Mansion'' series. This variant is listed as a High-End character and has the [[Bob-omb Cannon]] special skill. '''King Boo (Gold)''' was introduced for the 2020 [[Halloween Tour (2020)|Halloween Tour]], sporting a golden body and blue-jeweled silver crown. Also listed as a High-End driver, he uses the [[Coin Box]] as his special skill and, like other metallic characters, a distorting filter is applied to his voice. Unlike most characters, King Boo's head icon is recycled from ''Mario Kart 8 Deluxe'', rather than having a new one that uses his in-game model. Similarly, the head icons for his ''Luigi's Mansion'' and gold counterparts also use their in-game artwork.
 
In pre-release materials, including the [[List of Mario Kart Tour pre-release and unused content|beta test]], King Boo was classified as a Super Rare (High-End) driver and his special skill was the [[Double Bob-ombs]], sharing his change in classification between the beta test and final game with Rosalina.
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===''Super Mario'' series===
====''Super Mario 64 DS''====
{{quote|Eee hee hee! I am Big Boo, the spookiest of all the spirits! I locked up the [[Luigi|wimpy green moustache man]]. And I'll do the same to [[Mario|you]]! Eee hee hee! Since I'm a ghost, I can turn invisible in the mirror's reflection. You'll have to attack me from behind to defeat me. But you'll die of fright before that ever happens! And then you'll be one of us!|King Boo|Super Mario 64 DS}}
[[File:King Boo SM64DS boss fight.png|thumb|Mario engaged in battle with King Boo in ''Super Mario 64 DS'']]
King Boo<ref>{{cite|title=''Nintendo Power'' Volume 188|date=February 2005|page=79|publisher=Nintendo of America|language=American English|quote=(Luigi’s being held captive by King Boo, so you’ll have to rescue him first.)}}</ref> appears in ''[[Super Mario 64 DS]]'', imprisoning [[Luigi]] behind a [[painting]] in [[Big Boo's Haunt]]. When [[Mario]] enters the [[Big Boo Battle]] level to save Luigi, King Boo greets him. From there, the player must listen for King Boo's cackle and enter the door where it is loudest. Eventually, the player reaches the end and fights King Boo to free Luigi. To defeat King Boo, the player has to follow King Boo's movements in the arena's mirror and [[stomp]] him when he comes close enough. Defeating him results in King Boo giving out the [[Luigi Key]]. The player can fight him again as different characters, notably Luigi (who can be fought before unlocking him with [[Luigi Cap|his cap]]) and [[Wario]]. When Luigi meets King Boo, he is confused but proceeds to attack him anyway. When Wario fights him, King Boo is alarmed by his appearance and attempts to scare and attack him.
 
In {{wp|Western world|Western}} releases, King Boo is incorrectly called [[Big Boo (character)|Big Boo]], even though he would appear to be different from the Big Boo of Big Boo's Haunt. Internally, they use the same model, with a modifier denoting the presence of the crown.
 
====''New Super Luigi U'' / ''New Super Mario Bros. U Deluxe''====
King Boo makes a small cameo in ''[[New Super Luigi U]]'' and ''[[New Super Mario Bros. U Deluxe]]'' in the secret exit of [[Vanishing Ghost House]], where his art from ''Luigi's Mansion: Dark Moon'' can be seen in the form of a sign hanging from the side of the building.
 
====''Super Mario Bros. Wonder''====
[[File:SMBWKingBoo.png|thumb|left|King Boo in ''Super Mario Bros. Wonder'']]
In ''[[Super Mario Bros. Wonder]]'', King Boo appears in the levels [[Light-Switch Mansion]] and [[The Final Battle! Bowser's Rage Stage]], where he chases the player(s) in a similar manner to [[Boohemoth]] in ''[[New Super Mario Bros. 2]]''.<ref name=CM>{{cite|language=ja|author=Nintendo 公式チャンネル|date=September 28, 2023|url=youtu.be/SiLFeqd99cw|title=スーパーマリオブラザーズ ワンダー CM ワンダー篇|publisher=YouTube|accessdate=September 28, 2023}}</ref> In Light-Switch Mansion, King Boo appears once the [[Wonder Flower]] is collected and the [[Wonder Effect]] "A Night at Boo's Opera" is activated. King Boo then chases the player(s) through the level while singing with an operatic baritone voice. If he is looked at, he will cover his face and continue singing, albeit with a voice distortion filter. Once the [[Wonder Seed]] is collected, King Boo's crown will fall off as he shrinks into a regular Boo.<ref>{{cite|author=YTSunny|date=October 19, 2023|url=youtu.be/KWRFFbE5OXc|title=Super Mario Bros Wonder - All Songs / Music Levels|language=en|publisher=YouTube|accessdate=November 4, 2023}}</ref> In The Final Battle! Bowser's Rage Stage, King Boo appears once the player(s) reach the Jack-o-Lantern pumpkins, acting as he does in the other level. Once players enter the zero-gravity section, King Boo again loses his crown and shrinks into a regular Boo, although he floats away off-screen surrounded with music notes.<ref>{{cite|author=Mixeli|date=October 19, 2023|url=youtu.be/jRiP86jxIME|title=Super Mario Bros. Wonder - Final Boss Bowser Battle and Ending (HQ)|publisher=YouTube|accessdate=November 4, 2023|language=en}}</ref>


===''Mario Baseball'' series===
===''Mario Baseball'' series===
King Boo later appeared in ''[[Mario Superstar Baseball]]'' as a playable character. He was a member of [[Wario]]'s baseball team. King Boo was a power hitter in this game; he could use his white, Boo-like baseball bat (topped with a crown) to hit long outfield drives and even homeruns. King Boo reappeared in the sequel ''[[Mario Super Sluggers]]''.
====''Mario Superstar Baseball''====
King Boo is a default playable character in ''[[Mario Superstar Baseball]]'' and appears as a member of [[Wario]]'s baseball team, the [[Wario Greats]]. As a Power type character, he is capable of hitting long outfield drives and even home runs. However, like Boo, his hits are usually very curved, resulting in hitting fouls plenty of the time. Aside from good batting, King Boo has average pitching and fielding, and is a slow runner. His ability is Super Jump, allowing him to catch high balls in the outfield. King Boo has good chemistry with [[Boo]] and [[Petey Piranha]], and he has bad chemistry with [[Luigi]] and [[Baby Luigi]]. Additionally, he wields a Boo-like baseball bat that sports a physical crown on the end of it.


====''Mario Super Sluggers''====
[[File:MSS King Boo Batting Screenshot.png|thumb|left|King Boo batting at [[Yoshi Park]] at night in ''Mario Super Sluggers'']]
King Boo returns as a default playable character in ''[[Mario Super Sluggers]]''. He is once again a default member of Wario's team, the Wario Muscles, making him and Boo the only team players to still be on Wario's team, alongside the captain Wario and sub-captain [[Waluigi]]. He has similar stats to the previous game, although his pitching is improved and matches his batting power. As well, his ability is now Teleport, which activates during close plays, allowing him to teleport safely onto the base when successful. In this game, he has good chemistry with Petey Piranha, Boo, [[Wiggler]], and [[King K. Rool]], but he has bad chemistry with [[Mario]], Luigi, [[Yoshi]], [[Baby Mario]], Baby Luigi, [[Baby Peach]], and [[Baby Daisy]]. His baseball bat also no longer has a physical crown on it, instead having a crown emblem above the Boo emblem on his bat. Additionally, in this game only, the colors of the jewels on King Boo's crown are reversed.
In Challenge Mode, King Boo appears immediately after the player defeats [[Bowser Jr.]] at the [[Wario City]] stadium, stating that he turned invisible and was watching the whole game. However, he is uninterested in joining the player's team unless the team has some Boos with them. This is accomplished by both recruiting Boo and finding the [[Mini Boo]] item.
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===''Super Princess Peach''===
===''Super Princess Peach''===
King Boo aided Bowser in another one of his schemes in ''[[Super Princess Peach]]''. During the events of the game, Bowser's forces overwhelmed and captured both Mario and Luigi, along with a cavalcade of Toads. Although King Boo did not get to directly watch over Mario or Luigi, he was given a captured Toad to guard (Mario was Bowser's prisoner, while [[Kamek]] protected a captured Luigi). Without the Mushroom Kingdom's greatest heroes, it was up to Princess Peach, the leader of the Mushroom Kingdom, to take matters into her own hands.
[[File:Shriek Mansion 3-6.png|thumb|[[Princess Peach]] battling King Boo in ''Super Princess Peach'']]
 
King Boo aids Bowser in ''[[Super Princess Peach]]'' by appearing as the boss of [[Shriek Mansion]]. After adventuring through [[Vibe Island]], Peach discovers where King Boo is and engages him in combat. During the battle, King Boo fires blue homing [[fireball]]s at Peach and chases her regardless of whether she looks at him or not. Peach can damage King Boo with direct light, which is made by having his own flames light the candles spread throughout the room. After a few attacks, King Boo uses his [[Gloom]] vibe, which causes him to cry, which extinguishes the candle flames. After enough attacks, King Boo is eventually defeated. With King Boo eliminated, Peach rescues the Toad and continues against Bowser's forces.
After adventuring through [[Vibe Island]], Peach discovered the location of King Boo and engaged the ghost leader in combat. During the battle, the Boo leader fired blue homing [[fireballs]] at the Princess. Toadstool could damage the King Boo with direct light, and after enough attacks, King Boo succumbed to Peach's assault. With the threat of King Boo eliminated, Peach rescued the captured Toad and continued her campaign against Bowser's forces. Ultimately, Peach defeated both Kamek and Bowser, and rescued the heroes Mario and Luigi.


===''Mario Party'' series===
===''Mario Party'' series===
====''Mario Party 8''====
====''Mario Party 8''====
[[Image:KBMP8SC.jpg|thumb|King Boo reluctantly gives [[Waluigi]] a [[Star]].]]
In ''[[Mario Party 8]]'', King Boo gives out [[Star (Mario Party series)|Stars]] on his own board [[King Boo's Haunted Hideaway]]. He hides in one out of three altars and gives the player a Star for ten coins if they can find him where he is hiding. If the player is able to buy the Star, he starts to "summon the bizarre" and disappears, causing the player to jump into a [[Warp Pipe]] that returns them to the starting point. This "makeover mojo" causes the whole layout of the course to change. However, if they do not have enough coins, King Boo causes a pitfall to appear under the player, causing them to return to the starting point and allowing the next player that reaches him to buy the Star. Additionally, if the player fails to steal anything from the board event Pickpocket Pinball, the hosting [[Little Mouser|mouse]] sounds like King Boo. The player can purchase King Boo sounds from the [[Fun Bazaar]], along with a figurine titled "King Boo's Revenge". When the player presses {{button|wii|A}} on the figurine during the Figurine Parade, King Boo floats up and gives off a brilliant glow, as if he is a light bulb.
King Boo makes his first appearance in a ''[[Mario Party (series)|Mario Party]]'' game in ''[[Mario Party 8]]''. He is the star-giver of the course [[King Boo's Haunted Hideaway]]. He gives the player a Star for ten coins if they can find him where he is hiding. Afterwards, he summons some Pink Boos to send the character back to the starting point. Additionally, when the players loses the mini-game [[Pickpocket Pinball]], the mouse sounds like King Boo. The player can purchase King Boo sounds from the Fun Bazaar.


==Characteristics==
====''Mario Party 9''====
===Traits and Abilities===
[[File:MP9 King Boo's Puzzle Attack 1.png|thumb|left|King Boo in his boss minigame in ''Mario Party 9'', King Boo's Puzzle Attack]]
Besides possessing the abilities of other Boos, including the ability to teleport, King Boo has a number of other magical powers. Notably, it should be mentioned that King Boo's power increases when he is in the presence of other Boos. For example, King Boo had the power to blow Luigi to the Foyer only when enough Boos were in the mansion. King Boo also has the incredible power to materialize things out of thin air, including highly detailed mansions. He has also shown the ability to create Boos, bubbles, and blue fire, which he spits out of his mouth.
King Boo appears as the stage boss of the board [[Boo's Horror Castle]] in ''[[Mario Party 9]]''. He is fought in the minigame, [[King Boo's Puzzle Attack]], where the competitors line up power-ups in lines of three or more to deal damage to him. Once his health reaches halfway, he throws Boos onto the field which can stun the player's cursors, making them unable to move until they shake the Boo off. What is unique about his boss battle is that if a player gets the Final Attack, they get ten points instead of the usual three, likely because the players can easily accumulate points up to fifty. In the [[Bowser's Block Battle|final fight]] against Bowser, King Boo can also appear to hinder the players' progress. If Bowser throws the die with all the stage bosses' faces on it and King Boo's face appears on top, King Boo materializes above the stage. Then, he summons five Boos that move in a counterclockwise direction while moving outwards. When the Boos reach the boundaries of the stage, King Boo summons another five Boos, except this time they move clockwise. After that, King Boo disappears from the battle unless his face appears on the top of the die again.


Although King Boo is a lot larger than regular Boos, he is not the largest of the Boos. However, even gigantic Boos like Boolossus follow his leadership, despite their superior size. This is likely because he is the most intelligent and the most powerful of the Boos. King Boo seems to have a passion for gambling, as the entrance to each wing in Luigi's Mansion was modeled after a playing card suit (spade, club, heart, and diamond). The Boo leader also lived in a casino during the events of ''Super Mario Sunshine'', using a slot machine to produce random events in battle.
Like most other characters in the game, King Boo has a constellation that can be returned to the sky; it is called the Ghost Major. It is located in the farthest left portion of the sky, near [[King Bob-omb]]'s constellation and right next to Boo's constellation. Like all constellations, it can be bought for fifty Minigame Points. Also, in the [[Mario Party 9#Museum|Museum]]'s Sound Test, there are two voice sounds with the name "King Boo's Entrance"; one is of King Boo and the other is actually of Boo.
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====''Mario Party 10''====
[[File:King Boo's Tricky Tiles MP10.png|thumb|King Boo in his boss minigame in ''Mario Party 10'', King Boo's Tricky Tiles]]
King Boo in ''[[Mario Party 10]]'' is a boss in the minigame [[King Boo's Tricky Tiles]]. In order to defeat him, the player must remember which platforms are false, and then run around until they can jump on a light switch (one is worth 3 points, and another worth 1 point). Like other bosses, King Boo gets angered after the players deplete his health halfway. The technique that King Boo uses is that he swaps Boos with platforms and he blocks the camera, so the player can't see the platforms very well and remember which ones are false. He can also be seen on the [[Luigi Board]], which appears in the game's amiibo Party mode.


King Boo has an extreme dislike for the Mario Bros., due to their constant intervention in the plans of the Boo leader and others of his kind. Lastly, King Boo has a distinct cackle, which is significantly lower in pitch than other Boos.
====''Mario Party: Star Rush''====
King Boo returns as a boss in ''[[Mario Party: Star Rush]]'' in his minigame, [[King Boo's Light Smite]]. In order to defeat him, players have to use [[Light Box]]es which they need to carry over rotating platforms while evading [[Peepa]]s. Once he loses half his health bar, the rotating platforms start moving faster and more Peepas appear, making it more difficult to reach the other side.
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===Physical Appearance===
====''Mario Party Superstars''====
King Boo's appearance has changed many times throughout his video game history. In ''Luigi's Mansion'', for example, King Boo has red eyes shrouded in black circles (quite possibly from insomnia), a blue tongue, two vampire-like fangs, a purplish complexion, and a ruby crown. In ''Super Mario Sunshine'', King Boo has a golden crown, blue eyes, a flatter composition and a bigger, wider mouth housing a large, lolling tongue. In recent appearances, the ghost leader resembles a white, normal-looking Big Boo with a golden crown, as he did in the "Big Boo Battle" in ''Super Mario 64 DS''.
King Boo appears in ''[[Mario Party Superstars]]'' on [[Horror Land]], replacing the [[Big Boo (character)|Big Boo]] found on the original board.<ref>{{cite|author=Nintendo|date=September 23, 2021|url=www.youtube.com/watch?v=dG9fAtmYdlM|title=Nintendo Direct - 9.23.2021|publisher=YouTube|accessdate=September 23, 2021}}</ref> He summons Boo lackeys to steal coins (for free) or Stars (for 150 coins) from all opponents who have any. As with the Big Boo in the original, he can only be encountered at night and only through a path that requires a [[Skeleton Key]].
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==Boo Leadership==
===''Mario & Sonic'' series===
Although he commands a large band of Boos, not all Boos call King Boo their leader. Some Boos work directly for Bowser, while a small band of Boos are allied with [[Bow|Lady Bow]]. The latter ghosts live peacefully with the other denizens of the Mushroom Kingdom (although they still like to scare other [[species]], especially [[Toads]], from time to time).
====''Mario & Sonic at the Olympic Winter Games''====
[[File:King_Boo_-_Winter_Games.jpg|thumb|upright=0.85|left|[[Mario]] races against King Boo in the Wii version of ''Mario & Sonic at the Olympic Winter Games''.]]
In the [[Wii]] [[Mario & Sonic at the Olympic Winter Games (Wii)|version]] of ''Mario & Sonic at the Olympic Winter Games'', King Boo appears as the first and sixth (in Individual Festival mode only) rival. King Boo races the player in the [[Alpine Skiing Downhill]] event in both Individual and Group Festival modes but he only races the player in Giant Slalom in the Individual Festival mode, making him the only rival that can potentially be faced more than once. King Boo has no skis so he goes down the hill smoothly. If the player loses to him, the guide (either [[Cream (character)|Cream]] or [[Toad]]) says that it is unfair because King Boo has no skis.
[[File:KingBoo MASATOWG.png|thumb|King Boo as he appears in the DS version of ''Mario & Sonic at the Olympic Winter Games'']]
In the Adventure Tours mode in the [[Nintendo DS]] [[Mario & Sonic at the Olympic Winter Games (Nintendo DS)|version]], King Boo is the mid-boss of [[Polastraits]]. When the challenger approaches him, King Boo tells Mario/Sonic that he must race someone afraid of him. He selects Luigi and they must race in Giant Slalom. In this version, King Boo is transparent and the player can ski through him. He also appears slightly larger than in his other appearances.
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==Personality==
====''Mario & Sonic at the London 2012 Olympic Games''====
King Boo is shown to not hold a grudge, even when Luigi defeated him in ''[[Luigi's Mansion]]''. He is one of Bowser's righthand men because of his intellegence and power. He also says that he fears nothing except the Poltergust 3000, although in Super Mario 64 DS reveals that Wario scares him, so the previous statement is false. King Boo is also very confident, and likes to kidnap Mario. He is also shown to talk a lot more than other characters.
[[File:M&S 2012 The Ghostly Tower.png|thumb|left|200px|King Boo in [[The Ghostly Tower]]]]
In the Wii version of ''[[Mario & Sonic at the London 2012 Olympic Games (Wii)|Mario & Sonic at the London 2012 Olympic Games]]'', King Boo is one of the rival characters who can be found in the London Party mode, and when he is encountered, he challenges the player to the [[Dream Sprint]] event, with stickers being offered as a reward for beating him.


==Trivia==
In the Nintendo 3DS [[Mario & Sonic at the London 2012 Olympic Games (Nintendo 3DS)|version]], King Boo appears in the Story Mode, where he helps guard the [[Phantasmal Fog]] at the [[Tower of London]], and teams up with a Boo to challenge [[Sonic]] and [[Tails]] in [[Badminton (Doubles)]]. When defeated, he and the Boo flee, and King Boo later appears at the opening ceremony for the games. A [[List of badges in Mario & Sonic at the London 2012 Olympic Games (Nintendo 3DS)|badge]] of King Boo can also be obtained from the badge machine.
*When King Boo says, ''"I don't plan to give up my favorite decoration. I like Mario where he is."'' is a quote derived from ''Star Wars VI: Return of the Jedi'', when Jabba the Hutt said, ''"I don't plan to give up my favorite decoration. I like Captain Solo where he is."''
* King Boo is one of the two characters that can be seen floating in the player selection screen of ''[[Mario Kart Wii]]'', the other is [[Rosalina]].
King Boo is one of the three characters who appear as rivals in ''Mario & Sonic at the London 2012 Olympic Games'' but do not appear as playable characters in any version of ''Mario & Sonic at the Rio 2016 Olympic Games''. The other two are Boo and [[Magikoopa]].
*In ''[[Mario Kart Wii]]'', King Boo and [[Baby Mario]] are the only characters that get a good handling bonus.
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*The two games that King Boo was playable in the ''Mario Kart'' series were the same games where Boo wasn't an item.
*The King Boo character in ''[[Super Mario Sunshine]]'' was named "Boss Teresa" in the Japanese version. Judging from his different name and distinct appearance, it is likely to be another character entirely, though the game makes several references to Luigi's Mansion.
====''Mario & Sonic at the Sochi 2014 Olympic Winter Games''====
*In ''Super Mario 64 DS'', although King Boo is in a level that [[Yoshi]] can't enter, if the [[Player|player]] uses a code, so he can quickly switch from his current character to Yoshi as he or she enters Big Boo Battle (or even Big Boo's Haunt for an added challenge), then Yoshi can face and defeat King Boo (although he can't punch or kick, he still can ground pound the spooky spirit thrice). Oddly though, just as King Boo appears to face the green dinosaur, he says nothing at all. A text box appears, but nothing is written on it. A same empty text box appears when he's defeated by Yoshi as well. This could imply that Yoshi was never actually planned to face King Boo, not even in the [[Beta Elements|Beta]] version. Thus, no text was programmed for King Boo if Yoshi was to face him.
King Boo appears in ''[[Mario & Sonic at the Sochi 2014 Olympic Winter Games]]'' as a rival in the [[Legends Showdown]] mode. He appears in Area 4 and challenges the player in [[Short Track Speed Skating 1000m]].
*In ''Mario Superstar Baseball'', King Boo was often nicknamed "King Foul Ball" by fans for being a character who easily fouls.
 
*The King Boo is one of the two main antagonist in the 3D Mario series games, the other is [[Bowser]]
===''Mario Golf: World Tour''===
[[File:King Boo golf cameo.jpg|thumb|King Boo in ''Mario Golf: World Tour'']]
King Boo appears in ''[[Mario Golf: World Tour]]'' on Hole 4 of [[Bowser's Castle (golf course)|Bowser's Castle]]. He is floating in the background alongside other [[Boo]]s, and he is also much larger than in other games. His name can also appear on the tournament scoreboard.
 
===''Super Smash Bros.'' series===
There are a few items of King Boo in the [[Super Smash Bros. (series)|''Super Smash Bros.'' series]]. In ''[[Super Smash Bros. for Nintendo 3DS]]'', there is a [[Trophy (Super Smash Bros. series)|trophy]] of King Boo. In ''[[Super Smash Bros. Ultimate]]'', King appears in his ''Luigi's Mansion: Dark Moon'' design as an Advanced-class Neutral-type primary [[Spirit (Super Smash Bros. Ultimate)|spirit]], which is enhanced from the Boo spirit after it has reached level 99. When equipped, the spirit grants the fighter slower fall speed after jumping and has 3 support slots. King Boo is listed as the 49th spirit, though he was listed as the 121st spirit alongside the rest of the spirits from the ''Luigi's Mansion'' series in version 1.0.0.<ref>{{cite|author=BeardBear|date=December 6, 2018|url=youtu.be/CiK68gO5XQM?t=336|timestamp=05:36|language=en|title=Super Smash Bros. Ultimate - All 1297 Spirits|publisher=YouTube|accessdate=December 23, 2018}}</ref>
 
===''Puzzle & Dragons: Super Mario Bros. Edition''===
King Boo appears as a boss and enemy in ''[[Puzzle & Dragons: Super Mario Bros. Edition]]'', mostly appearing at the Ghost House courses. His main attribute is Dark, while his sub-attribute is Light. As an ally, King Boo's skill can heal 1000 HP, and change all Heart Orbs into Dark Orbs. His Awoken Skill raises the amount of time that the player has to move Orbs around.
 
As an enemy, King Boo is capable of decreasing the player's maximum time to move Orbs around. Also, King Boo is treated as a generic enemy, so he can still appear as an enemy, regardless of whether or not the player has King Boo in their party. Big Boo can be transformed into a King Boo with six [[Boo Mushroom]]s as a Transformation Item, making it possible to create multiple King Boos on the player's team.
 
When King Boo attacks, a bunch of [[Boo]]s attack with him.
 
King Boo's best stats are his ATK and RCV, while his HP is at an average level.
 
===''Mario & Luigi: Paper Jam''===
{{quote|Look at this little scrap. Friend of yours, is he? Well, if you like your friend, you better stop attacking me! Now, don't go thinking it's OK to attack my little minion either. Who knows what could happen if he dropped your little friend there... You got that?|King Boo|Mario & Luigi: Paper Jam}}
[[File:M&L Paper Jam King Boo.png|thumb|left|250px|King Boo, attempting to fool Mario and Luigi by disguising himself as Paper Mario, in ''Mario & Luigi: Paper Jam'']]
 
King Boo appears as a boss in ''[[Mario & Luigi: Paper Jam]]''. King Boo has a papercraft version of himself piloted by [[Morton Koopa Jr.|Morton]] and [[Lemmy Koopa|Lemmy]], which is fought in [[Bowser's Castle]]. The Mario Bros. use Papercraft Yoshi to fight it.
 
The real King Boo is encountered and fought in [[Gloomy Woods]] after the trio separate, leading to him kidnapping Mario and [[Paper Mario (character)|Paper Mario]]; leaving Luigi alone to find them, like in the ''Luigi's Mansion'' series. After finding [[Mario]], he and Luigi begin to look for Paper Mario. They eventually find King Boo instead, disguised as Paper Mario. When they group together, King Boo reverts back to normal and laughs at the Bros. for a second, before re-transforming; Mario and Luigi then turn around, and are unaware of King Boo's presence. When they turn around again, King Boo reveals himself again, but is caught by the duo. In an attempt to fool them, he immediately reverts back to Paper Mario, and tries to convince the Bros. that he is the real Paper Mario, but fails. King Boo then loses control of his transformation powers, as he quickly transforms into Paper Peach and then Paper Bowser, before finally gaining control and giving up; reverting back to his true form, causing the battle to commence.
 
King Boo attacks by spitting blue fireballs at either Mario or Luigi before inhaling them; making them need to avoid the fireballs twice, and splitting into five copies before floating slowly towards the trio, turning invisible as he gets near; which the trio must counter using their hammers around 2 seconds after a copy turns invisible. During the battle, King Boo calls a [[Paper Boo]] holding the real Paper Mario onto the battlefield; threatening to harm Paper Mario if the bros attack either himself or the Paper Boo. In order to save Paper Mario, Mario and Luigi must defeat the minion holding onto Paper Mario, causing it to drop him. If King Boo is attacked while the Paper Boo is on the battlefield, he deals damage to Paper Mario. After a few turns, another Paper Boo can grab Paper Mario again, taking him out of the battle (which gets rid of Paper Mario's copies) temporarily. Finally, King Boo also has a chase attack where he grows bigger before attempting to shoot a giant blue fireball at the trio; which Mario and Luigi have to counter by throwing Paper Mario's boomerang form into King Boo's mouth while it is open. Once defeated, Paper Mario is reunited with the duo and the group continues to [[Mount Brrr]].
 
Due to his crown, King Boo is immune to the brothers' [[Jump]] attack (but he can be hit by [[Hammer]] attacks, unlike Paper Boos) and certain [[Bros. Attack]]s, such as the [[Rocket Blast]] and [[Mega Thwonk]]'s jumping attacks (only in the [[Arcade (Mario & Luigi: Paper Jam)|arcade]]). Attacking King Boo using attacks from above results in the Bro. taking 1 damage as if they were jumping on a spiked enemy. The [[Dropchopper]], however, can circumvent this as it can be aimed towards King Boo's forehead instead of his crown and can then damage him.
 
The splitting attack used by King Boo is a reference to (if not a direct copy of) the [[Dark Star]]'s splitting attack in ''[[Mario & Luigi: Bowser's Inside Story]]'', except King Boo takes damage if countered unlike the Dark Star's version due to it being invincible. As well, if the Mario Bros. continue to attack King Boo without freeing Paper Mario, his slapping Paper Mario may be an allusion to [[Lady Bow]] and her slap attacks<ref>{{cite|author=Gaming Reinvented|date=January 8, 2016|url=www.youtube.com/watch?v=74SYLTwZ2Aw|title=Mario & Luigi Paper Jam; King Boo Kills Paper Mario!|publisher=YouTube|accessdate=February 7, 2024}}</ref>. Also, King Boo's voice clips from ''[[Mario Kart Wii]]'' are reused.
{{br}}
 
===''Mario + Rabbids Kingdom Battle''===
King Boo makes a cameo appearance in ''[[Mario + Rabbids Kingdom Battle]]'' in [[Spooky Trails]], where an image of him can be found on the ground in the area where the gramophone is found.
 
===''Mario Tennis Aces''===
King Boo appears in ''[[Mario Tennis Aces]]'' as part of the Boo Hunt Co-op Challenge available from version 2.0.0. When Frenzy Time is active, King Boo appears and hovers around the court. Players can continuously hit tennis balls at him to earn more coins. He disappears once either his health bar or the Frenzy bar is depleted. In this appearance, he does not use any of his normal voice clips, instead using those of a regular Boo.
 
===''Dr. Mario World''===
[[File:DMW-Dr. King Boo Solo Art.png|thumb|100px|Dr. King Boo in ''Dr. Mario World'']]
King Boo appears in ''[[Dr. Mario World]]'' as assistants, added on November 14, 2019.<ref>{{cite|author=DrMarioWorld_EN|date=November 14, 2019|url=x.com/Drmarioworld_EN/status/1195137397639536641|title=Blue: "Tiers 6 and 7 were added to versus mode! Apparently you can add a new assistant, King Boo, from the battle boxes for tier 7. You need 2,600 battle points to reach tier 7, but I know you can do it!" #DrMarioWorld|publisher=X|accessdate=September 28, 2020}}</ref> He is a battle box-exclusive assistant, only obtainable from battle boxes for tier 7 or above in versus mode. In versus mode, he has a chance of sending 2 extra rows of viruses to the opponent if the attack lands. In stage mode, he grants a chance of 5 extra capsules being added when 5 capsules are remaining, which will have a chance to activate again if the condition is met again but didn't activate earlier. However, it won't activate for the rest of the stage if this effect has successfully activated.
 
He also appears as a doctor named '''Dr. King Boo''', available September 28th, 2020. Like [[Dry Bowser|Dr. Dry Bowser]], he cannot be obtained in staffing and must be obtained through either in-app purchases or unlocking him through rewards such as in [[World 20]]'s Special Stage or through certain referrals. His skill is to eliminate an amount of viruses even those that would normally take multiple hits to clear such as [[floatie virus]]es. In stage mode, the amount is 5 viruses (4 prior to version 2.2.0), while in versus mode, the amount differs based on level, where it is 4 at level 1 with three extra viruses per level, up to 16 at the maximum level of level 5. In stage mode, if there are no more viruses while this skill is activated, it will eliminate one random object that can be eliminated instead, excluding capsules.
{{br}}
 
===''The Super Mario Bros. Movie''===
King Boo has a minor appearance in ''[[The Super Mario Bros. Movie]]'' at Bowser and Peach's wedding with his ''Super Mario'' design. He is seen sitting a few rows behind [[King Bob-omb]]. He does not have any role in the climax nor does he speak. He disappears once Peach, Mario, and [[Donkey Kong]] crash the wedding. Compared to his usual design, his face is smaller and is more expressive, taking up less space on his overall body and somewhat resembling that of the ''[[Super Mario Sunshine]]'' [[Big Boo (character)|King Boo]]. He is also the only Boo that appears in the movie.
 
==General information==
===Physical appearance===
{{multiple image
|align=right
|direction=horizontal
|footer=King Boo's ''Super Mario'' design (left) and his ''Luigi's Mansion'' design (right)
|image1=King Boo Artwork MSS.png
|width1=175
|image2=LM3 King Boo artwork.png
|width2=166
}}
King Boo has had two distinct appearances throughout his video game history. In most ''Super Mario'' games since ''[[Mario Kart: Double Dash!!]]'', King Boo resembles a normal Boo with a golden, five-pointed crown, though he is much larger. With this design, the crown has a blue jewel on the front and four red jewels around the sides in every game except ''Mario Super Sluggers'', where the colors are reversed. Like other Boos, King Boo is generally shown with an open, wide grin; however, when looked at, he closes his mouth and bashfully hides his face with his hands. In certain games like ''[[Mario Party 9]]'', King Boo's emotions are denoted by an aura surrounding him: when happy, he glows with a blue aura, and when angry, he glows with a red aura. Sometimes he also has steam coming out of him to display his anger. In ''[[Dr. Mario World]]'', he has a doctor's mirror on his crown and he carries a medicine box by strap. His gold variant in ''[[Mario Kart Tour]]'' is based on this design, and has an entirely golden body similar to a [[Gold Boo]], though his teeth and tongue are golden as well. His crown is silver and all five jewels are blue.
 
King Boo's other design was first used for his debut appearance in ''[[Luigi's Mansion]]'', and has since been reused in the subsequent ''[[Luigi's Mansion (series)|Luigi's Mansion]]'' games. This original design gave King Boo dark red eyes, a blue tongue, two vampire-like fangs, a greenish complexion, and a ruby in a gold, round-edged crown. He is also roughly the same size as other Boos. Starting with ''[[Luigi's Mansion: Dark Moon]]'', this design was slightly modified, giving him a full row of four teeth and a larger size typical of King Boo's modern design. Other differences include a larger shadow surrounding his eyes, a dark indigo mouth and tongue, and his crown containing a purple jewel and pointed edges. His [[:File:King Boo Artwork - Luigi's Mansion Dark Moon.png|artwork]] depicts him with purple eyes instead of red, its color in-game, and without his crown's pointed edges. He has also lost his original green tint, now being more of a lavender color. In ''[[Luigi's Mansion 3]]'', King Boo shows more expression, scowling at Luigi when first being found by him and appearing visibly disappointed when captured in the game's credits. He also has purple eyes in-game. His speech icon also uses a green shading reminiscent of his initial appearance, while his portraits show him with a purple crown. In ''Mario Kart Tour'', King Boo's ''Luigi's Mansion'' variant uses this design, although his tongue is more purple than indigo.
 
===Personality===
[[File:3DS LMansion 2 illu02 E3.png|thumb|200px|King Boo shows a particular disdain for Luigi in the ''Luigi's Mansion'' series.]]
King Boo is a sadistic villain who enjoys scaring and tricking his enemies by creating illusions and then overpowering and trapping them. King Boo often taunts Luigi and E. Gadd. In ''Luigi's Mansion 3'', for instance, King Boo mocks Mario and Luigi's Italian accent by saying, "It's-a me, King Boo!", and in ''Luigi's Mansion: Dark Moon'' he pretends to confuse between Luigi and Baby Luigi. In ''[[Mario & Sonic at the Olympic Winter Games (Nintendo DS)|Mario & Sonic at the Olympic Winter Games]]'', he insists on racing against Luigi, knowing how afraid he is of ghosts. King Boo also holds grudges, referring to his prior defeat in ''Luigi's Mansion'' sarcastically as "Good times" and he has stated that he is "sick to double death" of Luigi. In frustration, he recites the noise of the [[Poltergust 3000]], which he refers as a "disgusting machine", capturing him.
 
King Boo admires paintings and other decorations, such as making lengthy comments on how good Mario is as a painting; E. Gadd also comments that King Boo has decorated [[Treacherous Mansion]] to be scarier. He also desires to trap Luigi and E. Gadd through similar means.
 
King Boo boasts frequently about himself. He always proclaims his success in escaping, and he claims he fears nothing except the Poltergust 3000, although in ''[[Super Mario 64 DS]]'' he admits that Wario's face scares him. In the ''Mario and Sonic'' series, ''[[Mario & Sonic at the Olympic Winter Games (Wii)|Mario & Sonic at the Olympic Winter Games]]'', he claims that he is unbeatable at the [[Alpine Skiing]] event. Despite his power, he still covers his face in fear when looked at, much like a normal Boo. King Boo has a distinct cackle, which is quite lower in pitch than other Boos.
 
===Powers and abilities===
In ''[[Luigi's Mansion]]'', King Boo's power increases when he is in the presence of other Boos. For example, King Boo can blow Luigi to the Foyer when enough Boos are in the mansion. King Boo can also materialize things, including pulling a mansion out of the ghost dimension, creating replicas of some of Mario's enemies, other Boos, dimensions to battle in, bubbles, and blue fire (which he spits out of his mouth). King Boo can regenerate from his crown in ''[[Super Princess Peach]]''
 
In ''[[Luigi's Mansion: Dark Moon]]'', King Boo can open [[paranormal portal]]s to the ghost dimension, create traps such as sand patches, electrify terrain to shock Luigi, grow to large sizes, and teach Boos how to create [[Spirit Ball]]s. His new crown can also shoot an ectoplasmic laser that can shatter the [[Dark Moon]] or trap [[Toad (species)|Toads]] within paintings. King Boo can create illusions, hence his title "The Master of Illusions." In this game, similar to ''Luigi's Mansion'', his power is stronger when there are other Boos in the vicinity.
 
[[File:LM3 King Boo Final Battle.png|thumb|left|King Boo can create clones and shoot fireballs from his crown in the final battle of ''Luigi's Mansion 3'']]
In ''Luigi's Mansion 3'', King Boo summons magical paintings to trap people and, to a certain extent, objects inside. He can enlarge portraits in order to capture people, as an extension of his paranormal portals. He does not need the presence of other Boos to grow stronger in this game.
 
King Boo has a high power stat in many of his spin-off appearances. This is most noticeable in the [[Mario Baseball (series)|''Mario Baseball'' series]], where he is able to hit home runs easily. His great strength is also shown in ''Luigi's Mansion: Dark Moon'', as he summons and makes spike balls fall down simply by slamming the platform.
 
In ''[[Mario & Luigi: Paper Jam]]'', King Boo shapeshifts to trick Mario and Luigi by posing as Paper Mario, and he later briefly transforms into Paper Peach and Paper Bowser. He can also spit blue fireballs.
 
===Relationships===
====Enemies====
King Boo and Luigi are arch-nemeses in the ''Luigi's Mansion'' games. King Boo's motivation for trying to imprison Mario and Luigi is for revenge that both brothers have posed trouble against him in the past. King Boo additionally dislikes Professor E. Gadd for his ghost-capturing hobby, involving capturing his Boos. King Boo additionally states that the only thing that scares him is E. Gadd's invention, the Poltergust 3000.  In ''[[Mario Superstar Baseball]]'', King Boo has negative chemistry with Luigi and [[Baby Luigi]]; in ''[[Mario Super Sluggers]]'', he has bad chemistry with Mario, [[Princess Peach]], [[Princess Daisy]], [[Baby Mario]], [[Baby Peach]], [[Baby Daisy]], and [[Yoshi]]. King Boo also traps Toads in ''Luigi's Mansion: Dark Moon'' and captures Princess Peach in ''Luigi's Mansion 3''.
 
Generally speaking, King Boo cares nothing for ghosts that are not Boos, considering them expendable to advance his grand schemes such as in ''Luigi's Mansion: Dark Moon'' where he caused friendly ghosts to turn hostile so he can try to take over Mushroom Kingdom. Even Hellen Gravely, who has great admiration for King Boo, is seen by him as nothing more than a tool for his plans, and he is quick to dismiss her as useless once she fails to capture Luigi.
 
====Friends====
[[File:MP9 Bowser Block Battle 15.png|thumb|King Boo assists Bowser by summoning Boos in ''Mario Party 9''.]]
King Boo has been shown to work with Bowser on numerous occasions, including ''Super Mario 64 DS'', ''Mario Party 9'', and ''Super Princess Peach''. He also used a Bowser decoy and the two share a portrait after King Boo's defeat in ''Luigi's Mansion''. Despite this, the two share neutral chemistry in ''Mario Superstar Baseball'' and ''Mario Super Sluggers'', with King Boo appearing on [[Wario]]'s team rather than Bowser's. King Boo has also been paired up with [[Petey Piranha]] in ''Mario Kart: Double Dash!!'', with the two sharing chemistry in the ''Mario Baseball'' games. King Boo also has good chemistry with [[Wiggler]] and King K. Rool in ''Mario Super Sluggers''. ''[[Luigi's Mansion 3]]'' shows [[Hellen Gravely]] admiring King Boo, with her releasing him to impress and aid him in his plot for revenge against Luigi. However, her admiration is entirely one-sided as King Boo pays little consideration toward Hellen Gravely and is more interested in capturing Luigi and E. Gadd.
 
King Boo also relies on his Boo minions (even outright referring to them as his friends in ''Luigi's Mansion''), which cooperate to try to capture Luigi and his friends. In ''Luigi's Mansion'', he frees [[Boolossus]] from [[Professor Elvin Gadd|Professor E. Gadd]], and in ''[[Mario & Luigi: Paper Jam]]'', he threatens to hurt [[Paper Mario (character)|Paper Mario]] if the Mario Brothers hurt his [[Paper Boo]] minion. He has good [[chemistry]] with the playable Boo in the [[Mario Baseball (series)|''Mario Baseball'' series]]. In ''[[Mario Super Sluggers]]'', King Boo says that he finds little Boos cute. However, in the later ''Luigi's Mansion'' titles, he can be just as cruel to them as he is to his other ghost minions, showing no concern for them being sucked up by Luigi and even actively putting them in harm's way, as well as indirectly calling them useless in the latter game.
 
==Quotes==
{{main|List of King Boo quotes}}
*"''Aahh, I could just stare at my Mario painting for hours! It's true what they say about fine art...it takes utterly refined sensibilities to truly appreciate it! The way you plead for help, Mario... I find it so...satisfying. Perhaps that is merely because I remember how much trouble you've caused me in the past. ... Seriously, though, who would actually believe that mansions get given away in contests?! Talk about stupid! What do they feed you Mario brothers anyway...gullible soup? Your brother came all this way just to get turned into a painting... It's just terrific. However... This Mario painting looks lonely... I must have a Luigi painting as well! Then my gallery will truly be complete! Bleah HA HA! I am not afraid of you, fool! I fear only that infernal Poltergust 3000 you carry on your back! Stupid machine! But I am a KING among Boos! I swear it... I shall fear no mere house-cleaning device!! I must say...I despise the way you SHWEEERRPP-SHLOOOOP-WHOOORPP-SHLEEEOOORG-vacuumed up all my friends! Don't imagine that I'll flee... I'll fight you like a true Boo! Now join your brother... ...inside the painting!''" - ''[[Luigi's Mansion]]''
*"''Bah! You don't have enough coins! King Boo says boo to you! And good-bye!!!''" - ''[[Mario Party 8]]''
*"''Say WHAT? You want ME to help YOOOOOU?''" - ''[[Mario Super Sluggers]]''
*"''Heh heh heh! I saw that Alpine Downhill event of yours yesterday! Looks like you need to take a lesson in speed from ME! And that lesson starts today! I challenge you to an Alpine Downhill match! Hee hee hee!''" - ''[[Mario & Sonic at the Olympic Winter Games (Wii)|Mario & Sonic at the Olympic Winter Games]]'' (Wii)
*"''...Hmm? One-two-three-four-five-six-sev-- WAIT! There should be seven! Who's missing!? [...] Luigi! What are you doing over there?! UGH! That's it! I'm sick to double death of you! You want to fight me? FINE! Let's go, Luigi! This is the end for you, once and for all! HERE I COME!''" - ''[[Luigi's Mansion 3]]''


==Names in Other Languages==
==Voice samples==
{{Foreignname|
{{media table
|Jap=キングテレサ<br />Kingu Teresa
|file1=King Boo's laugh 2004.oga
|JapM= King Teresa; King Boo, "Teresa" being Japanese for Boo
|title1=''[[Super Mario 64 DS]]''
|Ger=König Buu Huu
|description1=King Boo's laughter
|GerM= King Boo, "Buu Huu" being German for Boo
}}
|Spa= Rey Boo
|SpaM= King Boo; "rey" is king in Spanish
|Ita= Re Boo
|ItaM= King Boo
|Fra=Roi Boo
|FraM=King Boo}}


==Official Profiles and Statistics==
==Profiles and statistics==
'''Mario Kart: Double Dash!! Bio:''' ''If you're not afraid of ghosts, you will be once King Boo is through with you. To unlock him, finish the Mirror Mode Star Cup with a 1st place win.''
{{main|List of King Boo profiles and statistics}}


==Game Appearances==
==List of appearances==
{| class=sortable cellspacing=0 cellpadding=3 border=1 align=center width=100% style="border-collapse:collapse; font-family:Arial"
{{appearances list
|-
|title1=''[[Luigi's Mansion]]''
! width=50% | Title
|role1=Main antagonist, final boss
! width=20% | Description
|release1=2001
! width=20% | Release Date
|format1=[[Nintendo GameCube]]
! width=10% | System/Format
|title2=''[[Mario Kart: Double Dash!!]]''
|-
|role2=Unlockable playable character
| ''[[Luigi's Mansion]]''
|release2=2003
| Boss
|format2=Nintendo GameCube
| 2001
|title3=''[[Super Mario 64 DS]]''
| [[Gamecube]]
|role3=Boss
|-
|release3=2004
| ''[[Super Mario Sunshine]]''
|format3=[[Nintendo DS]]
| Boss   
|title4=''[[Mario Superstar Baseball]]''
| 2002
|role4=Playable character
| [[Gamecube]]
|release4=2005
|-
|format4=Nintendo GameCube
| ''[[Mario Kart: Double Dash!!]]''
|title5=''[[Super Princess Peach]]''
| Unlockable Playable Character
|role5=Boss
| 2003
|release5=2005
| [[Gamecube]]
|format5=Nintendo DS
|-
|title6=''[[Mario Kart DS]]''
| ''[[Super Mario 64 DS]]''
|role6=Boss in Mission Mode
| Boss
|release6=2005
| 2004
|format6=Nintendo DS
| [[Nintendo DS]]
|title7=''[[Mario Party 8]]''
|-
|role7=Non-playable character
| ''[[Mario Superstar Baseball]]''
|release7=2007
| Playable Character
|format7=[[Wii]]
| 2005
|title8=''[[Mario Kart Arcade GP 2]]''
| [[Gamecube]]
|role8=Cameo
|-
|release8=2007
| ''[[Super Princess Peach]]''
|format8=Arcade
| Boss
|title9=''[[Mario Kart Wii]]''
| 2005
|role9=Unlockable playable character
| [[Nintendo DS]]
|release9=2008
|-
|format9=Wii
| ''[[Mario Kart DS]]''
|title10=''[[Mario Super Sluggers]]''
| Boss
|role10=Playable character
| 2005
|release10=2008
| [[Nintendo DS]]
|format10=Wii
|-
|title11=''[[Mario & Sonic at the Olympic Winter Games]]''
| ''[[Mario Party 8]]''
|role11=Rival
| Non-playable Character
|release11=2009
| 2007
|format11=Wii, Nintendo DS
| [[Nintendo Wii]]
|title12=''[[Mario & Sonic at the London 2012 Olympic Games]]''
|-
|role12=Rival
| ''[[Mario Kart Wii]]''
|release12=2011, 2012
| Unlockable Playable Character
|format12=Wii, [[Nintendo 3DS]]
| 2008
|title13=''[[Mario Party 9]]''
| [[Nintendo Wii]]
|role13=Boss
|-
|release13=2012
| ''[[Mario Super Sluggers]]''  
|format13=Wii
| Playable Character
|title14=''[[Luigi's Mansion: Dark Moon]]''
| 2008
|role14=Main antagonist, final boss
| [[Nintendo Wii]]
|release14=2013
|-
|format14=Nintendo 3DS
|}
|title15=''[[New Super Luigi U]]''
|role15=Cameo
|release15=2013
|format15=[[Wii U]]
|title16=''[[Mario & Sonic at the Sochi 2014 Olympic Winter Games]]''
|role16=Rival
|release16=2013
|format16=Wii U
|title17=''[[Mario Golf: World Tour]]''
|role17=Non-playable character/cameo
|release17=2014
|format17=Nintendo 3DS
|title18=''[[Super Smash Bros. for Nintendo 3DS]]''
|role18=[[Trophy (Super Smash Bros. series)|Trophy]]
|release18=2014
|format18=Nintendo 3DS
|title19=''[[Mario Party 10]]''
|role19=Boss
|release19=2015
|format19=Wii U
|title20=''[[Puzzle & Dragons: Super Mario Bros. Edition]]''
|role20=Boss
|release20=2015
|format20=Nintendo 3DS
|title21=''[[Mario & Luigi: Paper Jam]]''
|role21=Boss
|release21=2015
|format21=Nintendo 3DS
|title22=''[[Luigi's Mansion Arcade]]''
|role22=Main antagonist, final boss
|release22=2015
|format22=Arcade
|title23=''[[Mario Party: Star Rush]]''
|role23=Boss
|release23=2016
|format23=Nintendo 3DS
|title24=''[[Mario Kart 8 Deluxe]]''
|role24=Playable character
|release24=2017
|format24=[[Nintendo Switch]]
|title25=''[[Mario Kart Arcade GP DX]]''
|role25=Playable character <small>(during a limited-time event)</small><br>Unlockable playable character <small>(for permanent use, through a limited-time event)</small>
|release25=2017
|format25=Arcade
|title26=''[[Mario + Rabbids Kingdom Battle]]''
|role26=Cameo
|release26=2017
|format26=Nintendo Switch
|title27=''[[Mario Tennis Aces]]'' (version 2.0.0)
|role27=Boss
|release27=2018
|format27=Nintendo Switch
|title28=''[[Luigi's Mansion (Nintendo 3DS)|Luigi's Mansion]]''
|role28=Main antagonist, final boss
|release28=2018
|format28=Nintendo 3DS
|title29=''[[Super Smash Bros. Ultimate]]''
|role29=[[Spirit (Super Smash Bros. Ultimate)|Spirit]]
|release29=2018
|format29=Nintendo Switch
|title30=''[[New Super Mario Bros. U Deluxe]]''
|role30=Cameo
|release30=2019
|format30=Nintendo Switch
|title31=''[[Dr. Mario World]]''
|role31=Assistant (update)
|release31=2019
|format31=iOS / Android
|title32=''[[Mario Kart Tour]]''
|role32=Unlockable playable character (update)
|release32=2019
|format32=iOS / Android
|title33=''[[Tetris 99]]''
|role33=Cameo in TETRIS x Luigi's Mansion 3 Event
|release33=2019
|format33=Nintendo Switch
|title34=''[[Luigi's Mansion 3]]''
|role34=Main antagonist, final boss
|release34=2019
|format34=Nintendo Switch
|title35=''[[Mario Party Superstars]]''
|role35=Non-playable character
|release35=2021
|format35=Nintendo Switch
|title36=''[[Mario Kart Live: Home Circuit]]'' (version 2.0.0)
|role36=Non-playable character
|release36=2021
|format36=Nintendo Switch
|title37=''[[Super Mario Bros. Wonder]]''
|role37=Enemy
|release37=2023
|format37=Nintendo Switch
}}


==Gallery==
==Gallery==
''<center><gallery>
{{main-gallery|King Boo}}
Image:KingBoo.jpg|<center>[[Luigi's Mansion]]
<gallery>
Image:KingbooSunshine.jpg|<center>[[Super Mario Sunshine]]
LuigisMansionKingBooModel.png|''[[Luigi's Mansion]]''
Image:Peteyboo.jpeg|<center>[[Mario Kart: Double Dash!!]]
King Boo MKDD Model.png|''[[Mario Kart: Double Dash!!]]''
Image:Boowiiking.PNG|<center>[[Mario Kart Wii]]
SPP-King Boo Sprite.png|''[[Super Princess Peach]]''
Image:Buuhuusluggazz.PNG|<center>[[Mario Super Sluggers]]
MP9 King Boo Bust.png|''[[Mario Party 9]]''
</gallery></center>
PDSMBE-KingBoo-TeamImage.png|''[[Puzzle & Dragons: Super Mario Bros. Edition]]''
MKT Artwork KingBooLuigisMansion.png|''[[Mario Kart Tour]]''
</gallery>


<br clear=all>
==Names in other languages==
{{Mario Villains}}
<!--To edit this table, access the "List of King Boo names in other languages" page and go to the "King Boo" section.-->
{{MK Players}}
{{main|List of King Boo names in other languages}}
{{:List of King Boo names in other languages|transcludesection=King Boo}}
 
==Trivia==
*When King Boo says, "''I will not give up my favorite decoration. I like Mario just where he is,''" he references a quote from ''{{wp|Return of the Jedi|Star Wars Episode VI: Return of the Jedi}}'', when {{wp|Jabba the Hutt}} says, "''I will not give up my favorite decoration. I like {{wp|Han Solo|Captain Solo}} where he is.''"
*King Boo's laugh originating from ''Luigi's Mansion'' is actually a pitched-up version of a stock laughing sound effect.<ref>{{cite|url=soundeffects.fandom.com/wiki/Sound_Ideas,_CARTOON,_LAUGHTER_-_LOW,_THROATY_LAUGH,_HUMAN_01|title=Sound Ideas, CARTOON, LAUGHTER - LOW, THROATY LAUGH, HUMAN 01|publisher=Soundeffects Wiki|accessdate=October 10, 2022}}.</ref> A pitched-down version of the same effect was previously used for [[Bleak]].
 
==References==
<references/>
 
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[[de:König Buu Huu]]
[[it:Re Boo]]

Revision as of 17:00, May 23, 2024

This article is about the character debuting in Luigi's Mansion. For his Super Mario Sunshine counterpart, see Big Boo (character).
King Boo
Artwork of King Boo in Mario Party: Star Rush
Artwork from Mario Party: Star Rush
Species Boo
First appearance Luigi's Mansion (2001)
Latest appearance Super Mario Bros. Wonder (2023)
“I am not afraid of you, fool! I fear only that infernal Poltergust 3000 you carry on your back! Stupid machine! But I am a KING among Boos! I swear it... I shall fear no mere house-cleaning device!!”
King Boo, Luigi's Mansion

King Boo is the leader of the Boos and ghosts, the main antagonist of the Luigi's Mansion series, and the arch-nemesis of Luigi. He is also an ally of Bowser and has aided him in his various schemes. He has succeeded in capturing Mario in the Luigi's Mansion games, as well as capturing Toads, Professor E. Gadd, and Princess Peach. Although not the biggest Boo, King Boo has some powers throughout the series, including materializing objects and spitting fire. King Boo's power is often directly proportional to the number of Boos in his vicinity.

History

Luigi's Mansion series

Luigi's Mansion

King Boo
Gold frame artwork of King Boo.
Full name Bowser and King Boo, the Dastardly Duo (GameCube)[citation needed]
King of Boos (3DS)
Age Unknown
Biography Nothing is known about this mysterious entity. (GameCube)[citation needed]

The giant Boo adorned with a crown. It's hard at work on other evil plans involving the other Boos. (Nintendo 3DS)

Room Roof/Secret Altar
HP 500
Luigi's Mansion Artwork: Bowser
Luigi's Mansion artwork of King Boo escaping from his Bowser suit

Prior to the events of Luigi's Mansion and its remake, Professor E. Gadd captured Boolossus in a portrait, using a device called a Ghost Portrificationizer. He later hung Boolossus's portrait to his Gallery inside his lab in Boo Woods. This angered King Boo, so he devised a plan to rescue Boolossus.

King Boo and his forces attacked the laboratory. The Boos reversed the settings of the Portificationizer and released Boolossus. King Boo then ordered that all the ghosts that E. Gadd had captured should be released as well. After releasing all the portrait ghosts, King Boo created a huge mansion and placed it next to the professor's lab. King Boo, his Boo minions, and the recently freed portrait ghosts decided to inhabit the mansion. With a huge mansion and an army of ghosts, King Boo decided to exact revenge upon Mario and Luigi for all the Boos they attacked during their adventures by capturing them.

Hoping to capture Luigi, King Boo sends him a letter. The message states that Luigi has won a mansion in a contest and provides the location of the prize. Luigi asks his brother Mario to investigate the mansion and says that he is arriving shortly thereafter. Mario travels to the mansion, but right after he enters, he is instantly overwhelmed by King Boo's forces and captured. King Boo then imprisons Mario in a portrait, and places him in the Secret Altar, located in the basement of the mansion.

While waiting for Luigi, King Boo and his Boo minions wait behind a secret door in the floor of the Storage Room. When Luigi enters the room and reveals the secret door, the Boos spring out from the floor. However, the Boos (including King Boo) stop their surprise attack when they notice the Poltergust 3000 on Luigi's back, which he had been given from E. Gadd in order to recapture the Portrait ghosts and save his brother. In fear of the device, King Boo and the other Boos scatter and hide in the mansion. King Boo travels to the Secret Altar in the mansion's basement.

The special key that Vincent Van Gore holds unlocks the path to the Secret Altar. However, he is locked in The Artist's Studio on the third floor of the mansion. After capturing him and retrieving the key, Luigi discovers that he still cannot enter the Secret Altar. If Luigi attempts to enter the Secret Altar without catching a certain number of Boos, King Boo blows Luigi to the Foyer, the entrance of the mansion. Since King Boo's power is related to the number of Boos in the mansion, Luigi can weaken him by capturing the Boos hidden in various rooms. After Luigi captures at least forty of the mansion's fifty Boos, King Boo loses his ability to blow Luigi from the Secret Altar. Once King Boo is weakened, Luigi enters King Boo's Secret Altar.

King Boo and Bowser boss battle
King Boo's boss fight in the 3DS remake

Upon entering the Altar, Luigi notices King Boo staring at Mario in the painting while insulting the brothers' intelligence for having fallen for his scheme. King Boo then turns around to face Luigi and states his desire to add a Luigi painting to the collection. After this, King Boo flies into the Mario painting hanging on the wall. The picture of Mario transforms into Bowser, then the new Bowser painting inhales Luigi into the canvas, transporting Luigi into an arena that resembles the mansion's roof. Luigi then confronts Bowser. In reality, this is a suit of Bowser that King Boo controls from the inside and uses as a shield.

King Boo uses this Bowser suit to attack Luigi, shooting flames at him causing ten HP of damage, and even attempting to inhale him into its mouth, deducting fifteen HP upon spitting him out. The suit also has the ability to create three large spiked bombs and toss them at Luigi, which when exploding, take away ten HP. Luigi can use his Poltergust 3000 to grab one of the spiked explosives and release it into the Bowser suit's mouth. This attack blasts the head off of the Bowser suit, causing King Boo to exit the shield and expose himself to the Poltergust 3000. Luigi begins to deplete the ghost's five hundred hit points. Meanwhile, the suit's head hovers around the arena, shooting icy blasts at Luigi, which freezes him briefly. King Boo, after a while, flies back into the dormant Bowser body and the head reattaches itself, resuming the fight. Luigi repeats this process, slowly weakening King Boo, but after King Boo's life falls below two hundred HP, the head of the suit reattaches backwards whenever he returns to the Bowser body, causing the Bowser suit to run around aimlessly. The suit soon corrects its head and resumes the fight. Eventually, Luigi manages to completely drain King Boo's HP and capture him inside the Poltergust 3000.

In the 3DS remake, hearts appear when the Bowser suit destroys a pillar, increasing the chance of getting a gold frame (platinum in Hidden Mansion). However, they do not appear in Boss Rush mode.

After the battle, Luigi receives King Boo's crown, worth 5000G, and adds it to his treasure collection. Upon returning to the mansion, Luigi quickly travels to Professor E. Gadd's lab. In the lab, Luigi connects the Poltergust to the professor's Portrificationizer, dumping its contents into the machine. Both King Boo and the fake Bowser appear on the Portificationizer portrait. With King Boo captured, Professor E. Gadd hangs his new portrait in an empty room in his gallery.

Luigi's Mansion: Dark Moon / Luigi's Mansion 2 HD

King Boo artwork
Artwork depicting King Boo's redesigned appearance for Luigi's Mansion: Dark Moon

King Boo reappears in Luigi's Mansion: Dark Moon as the main antagonist and final boss once more. He looks similar to his original appearance from Luigi's Mansion, but he retains the full set of teeth and sped-up voice he had in his appearances in the other Super Mario titles and is also much larger. He has a purple tongue and mouth and glowing purple eyes, and the dark area around his eyes is bigger and darker.

It is revealed later in the game that Professor E. Gadd had sold the portrait of King Boo from Luigi's Mansion at a garage sale (a car boot sale in British English versions), which is how the king escaped. King Boo shatters the Dark Moon into six pieces with a bolt of energy from his crown, which contained a power-enhancing gem. This turns the once-friendly ghosts of Evershade Valley hostile and mischievous as well as sprawling the Dark Moon's pieces to each Mansion of the valley, which Luigi has to recover.

Towards the end of the game, it is revealed that King Boo has captured Mario like he did in the last game. After Luigi obtains the last Dark Moon piece and returns to the Bunker, King Boo captures him and pulls him back into his dimension. He reveals to Luigi he escaped from the painting and broke the Dark Moon, causing the ghosts to become under his control. He intends to use the ghosts as an army to conquer both Evershade Valley and the Mushroom Kingdom while also planning to put Luigi, E. Gadd, and all their friends into paintings for revenge. He then engages into battle with Luigi.

During the final battle, King Boo summons a series of magic lightning bolts with his crown and will attempt to slam Luigi with his body. The latter causes spiked balls to fall from above, which will roll around the tilting platform to pose a hazard. King Boo will stop moving when looked at, and when caught underneath a falling ball he will become stunned, leaving him vulnerable to the Poltergust 5000. Once his HP is depleted and he gets sucked into the Poltergust 5000, he immediately breaks out and sends Luigi into a floating hallway. He then swells to a large size and begins rolling after Luigi, attempting to stall Luigi with various obstacles, such as falling shelves and suits of armor with large polearms. If King Boo does hit Luigi, he'll pause for a moment to laugh maliciously. Once Luigi makes it out of the hall, he will land on another tilting platform, where King Boo will repeat his previous patterns at a higher intensity. The battle concludes after the third battle and second hallway chase, leading to King Boo's defeat and being sucked into the Poltergust 5000.

Luigi's Mansion Arcade

King Boo is the final boss for Luigi's Mansion Arcade, leading his ghosts in an uprising to get revenge on Luigi and Professor E. Gadd. However, after Luigi has sucked in all of his minions with the Poltergust 5000, King Boo assaults Luigi on the terrace of the Treacherous Mansion. Protected by a magical barrier, he can only be attacked once he lets his guard down. King Boo throws bombs at the player, moves very quickly and clones himself multiple times over the course of the fight. However, only the original has the power-enhancing gem on his crown. Just like in Luigi's Mansion: Dark Moon, he escapes the Poltergust 5000 two times before being defeated for good.

Luigi's Mansion 3

King Boo chasing Luigi down the fifth floor hallway
King Boo chasing Luigi down a hallway in Luigi's Mansion 3

King Boo reappears in Luigi's Mansion 3 with the same design as in Luigi's Mansion: Dark Moon, but with more detail on his crown and a more expressive scowl. King Boo is one of the two main antagonists, having been released by the other main antagonist Hellen Gravely, the owner of The Last Resort hotel and a big fan of his, in order to impress him. Seeking revenge on Luigi for his previous defeats, he traps Professor E. Gadd, Mario, Princess Peach, and the three Toads in portraits before going after Luigi, who manages to escape his capture by going down a laundry chute. He later ends up entrusting Hellen Gravely with Mario's portrait, although it's implied that he intended for Luigi to win both due to Gravely's failures by that time and so he could capture both alongside Peach by using the latter as bait, also recapturing the Toads and Professor E. Gadd just after Mario was freed. However, he ultimately fails to capture Luigi atop the hotel due to Polterpup shoving him out of the way of King Boo's portrait, and then proceeds to battle Luigi. To defeat King Boo, Luigi must throw a bomb from a spiked ball King Boo throws into his mouth, then pull on his tongue with Gooigi's help and slam him repeatedly. Upon doing so, King Boo will then generate a clone that attacks alongside him. After this is done twice, King Boo will enlarge the painting, and Luigi will then have four minutes to attack King Boo one last time. The battle ends with King Boo being recaptured by Luigi and placed in a containment jar alongside Gravely, much to his frustration. As the purple gem in his crown was taken by Luigi after the final battle, it is missing from his crown.[1]

The clones that King Boo summons in the final battle reference his original design from Luigi's Mansion, as they only have two teeth, lacking the middle two fangs King Boo is depicted with now.

If the player gets a game over at any point during this game, King Boo will be shown trapping Luigi in a portrait alongside the rest of his friends.

Super Mario-kun

King Boo. Page 147, volume 26 of Super Mario-kun.
A depiction of King Boo in Super Mario-kun

King Boo appears in a short chapter on Luigi's Mansion of volume 26 of Super Mario-kun. As in the game, Luigi reveals King Boo by knocking off the Bowser illusion's head. Unlike in the games, however, King Boo is immediately sucked in.

Mario Kart series

Mario Kart: Double Dash!!

Artwork of Petey Piranha and King Boo for Mario Kart: Double Dash!!
King Boo and Petey Piranha are partnered racers in Mario Kart: Double Dash!!

King Boo is an unlockable character in Mario Kart: Double Dash!!, marking his first playable appearance. He is partnered with Petey Piranha, and both are unlocked by winning the Star Cup in Mirror Mode. His large size makes him a heavyweight driver, despite King Boo being a ghost. He and Petey Piranha can use almost any other character's Special Item, barring the Green Fireball or the Birdo's Egg. The special item they obtain depends on their current position in the race. King Boo's personal kart is the Boo Pipes, which is a gray version of Petey's Piranha Pipes kart, but with an image of a Boo instead of a Piranha Plant where the item-using partner stands. Additionally, it notably has a low speed stat and high acceleration stat, in contrast with the other heavyweight karts in the game. King Boo appears to slightly shrink when he becomes the driver. On the second "Thanks for Playing!" screen, King Boo appears in the background chasing Wario and Waluigi.

In the Template:Media link found in the demos and debug build of the game, King Boo is referred to as "Boss Teresa", the Japanese name used for the Big Boo boss from Super Mario 64 and Super Mario Sunshine, instead of his usual name "King Teresa".

Mario Kart DS

In Mario Kart DS, King Boo, along with six other bosses from Super Mario 64 DS, re-appears as one of the bosses of the Mission Mode. King Boo is the boss of the fourth level, with the playable character being Peach. Peach attempts to collect 50 coins on the Lava Arena within the time limit, but after a few seconds King Boo appears, surrounds her, and then attacks her, stealing ten of her coins and making all uncollected coins disappear, before teleporting to another area of the arena. To take them back, Peach has to drive and bump into King Boo, making him transparent. Then, she can drive through him again, retrieving her coins and making the other coins reappear. However, King Boo soon reappears a few moments later to get the coins again. After collecting all fifty coins, Peach finally defeats King Boo. Additionally, the Bowser and King Boo painting from Luigi's Mansion appears in the Luigi's Mansion race course, although only Bowser can be seen in the painting.

Mario Kart Arcade GP 2

A large picture of King Boo appears near the end of the Yoshi Park 2 course in Mario Kart Arcade GP 2, where it inhales many ghosts and the racers. As the player drives into his mouth, they are warped back to the beginning of the course.

Mario Kart Wii

SNES Ghost Valley 2
King Boo in Mario Kart Wii

King Boo returns in Mario Kart Wii as a large-sized driver, and is unlocked by completing the Star Cup in 50cc. He is also unlocked by playing 750 races. He features a good handling bonus and a small off-road bonus, which comes in handy for vehicles like the Offroader, Wario Bike, and Phantom. He is used as the Staff Ghost on the SNES Ghost Valley 2 course. In the credits, he appears driving the Jetsetter on the SNES Ghost Valley 2 course.

King Boo is one of the few characters to have his standing animation on the character select screen altered from Mario Kart: Double Dash!! In this case, his tongue is not sticking out of his mouth the whole time like before; now, before selecting him, his tongue is still in his mouth. Other characters whose poses were altered include: Yoshi, who is now looking at the screen; Birdo, whose bow was made larger; Diddy Kong, who is looking in a different direction; Wario, who now has short sleeves; Waluigi, who now performs a slightly different animation when selected; and Donkey Kong, whose mouth is not as wide open and is looking in another direction.

Mario Kart 8 Deluxe

Screenshot of Mario Kart 8 Deluxe.
King Boo in Mario Kart 8 Deluxe, wearing a crown from Battle Mode

King Boo returns as a playable character in Mario Kart 8 Deluxe, the enhanced port of Mario Kart 8 released for Nintendo Switch. He is among the lightest of the five heavyweight groups, sharing his statistics with Rosalina, Link, and Pauline. He has the lowest top speed and weight of all the heavyweights, all while sharing similar acceleration as other heavy groups. However, his handling is amongst the best of the heavyweights (shared with the metal characters and Petey Piranha). He also has the strongest mini-turbo boost of the heavyweights. Finally, his traction stat is noticeably strong, being far and away the best in his weight class, and the third best base traction stat in the game. Additionally, his horn sound is the sound that King Boo from Super Mario Sunshine makes when hit by a pepper. He is the 150cc Staff Ghost for GBA Boo Lake and the 200cc Staff Ghost for three courses: Twisted Mansion, GBA Snow Land, and 3DS Rosalina's Ice World. Initially, King Boo did not have a rival character for Grand Prix mode, but upon release of Wave 5 of the Booster Course Pass DLC, King Boo was given a rival in the form of Petey Piranha and also became Petey's rival, likely a nod to their status as partners in Mario Kart: Double Dash!! Because of this, he is the only base game character to gain a rival through the Booster Course Pass.

Mario Kart Arcade GP DX

King Boo appears as a featherweight playable character in Mario Kart Arcade GP DX, sharing his stats with Baby Mario and Baby Peach. He was originally only playable during a limited-time event campaign held between October 18, 2017, and January 10, 2018, in the Japanese version, though Bana Passport users could unlock King Boo permanently when they collected three in-game stamps, making him usable even after the event's duration. In an update released on October 10, 2018, he was made available for players who did not participate in the aforementioned event.

Mario Kart Tour

King Boo (Luigi's Mansion) in Mario Kart Tour
King Boo (Luigi's Mansion) in Mario Kart Tour

King Boo reappears as a playable character in Mario Kart Tour, available as of the 2019 Halloween Tour. He is classified as a Super driver, and his special skill is the Lucky Seven.

The game also features two other playable variants of King Boo. King Boo (Luigi's Mansion), also introduced to the game in the 2019 Halloween Tour, uses his design from Luigi's Mansion 3, marking the first time King Boo is playable using his appearance from the Luigi's Mansion series. This variant is listed as a High-End character and has the Bob-omb Cannon special skill. King Boo (Gold) was introduced for the 2020 Halloween Tour, sporting a golden body and blue-jeweled silver crown. Also listed as a High-End driver, he uses the Coin Box as his special skill and, like other metallic characters, a distorting filter is applied to his voice. Unlike most characters, King Boo's head icon is recycled from Mario Kart 8 Deluxe, rather than having a new one that uses his in-game model. Similarly, the head icons for his Luigi's Mansion and gold counterparts also use their in-game artwork.

In pre-release materials, including the beta test, King Boo was classified as a Super Rare (High-End) driver and his special skill was the Double Bob-ombs, sharing his change in classification between the beta test and final game with Rosalina.

Super Mario series

Super Mario 64 DS

“Eee hee hee! I am Big Boo, the spookiest of all the spirits! I locked up the wimpy green moustache man. And I'll do the same to you! Eee hee hee! Since I'm a ghost, I can turn invisible in the mirror's reflection. You'll have to attack me from behind to defeat me. But you'll die of fright before that ever happens! And then you'll be one of us!”
King Boo, Super Mario 64 DS
The boss fight against King Boo in Super Mario 64 DS
Mario engaged in battle with King Boo in Super Mario 64 DS

King Boo[2] appears in Super Mario 64 DS, imprisoning Luigi behind a painting in Big Boo's Haunt. When Mario enters the Big Boo Battle level to save Luigi, King Boo greets him. From there, the player must listen for King Boo's cackle and enter the door where it is loudest. Eventually, the player reaches the end and fights King Boo to free Luigi. To defeat King Boo, the player has to follow King Boo's movements in the arena's mirror and stomp him when he comes close enough. Defeating him results in King Boo giving out the Luigi Key. The player can fight him again as different characters, notably Luigi (who can be fought before unlocking him with his cap) and Wario. When Luigi meets King Boo, he is confused but proceeds to attack him anyway. When Wario fights him, King Boo is alarmed by his appearance and attempts to scare and attack him.

In Western releases, King Boo is incorrectly called Big Boo, even though he would appear to be different from the Big Boo of Big Boo's Haunt. Internally, they use the same model, with a modifier denoting the presence of the crown.

New Super Luigi U / New Super Mario Bros. U Deluxe

King Boo makes a small cameo in New Super Luigi U and New Super Mario Bros. U Deluxe in the secret exit of Vanishing Ghost House, where his art from Luigi's Mansion: Dark Moon can be seen in the form of a sign hanging from the side of the building.

Super Mario Bros. Wonder

King Boo in Super Mario Bros. Wonder
King Boo in Super Mario Bros. Wonder

In Super Mario Bros. Wonder, King Boo appears in the levels Light-Switch Mansion and The Final Battle! Bowser's Rage Stage, where he chases the player(s) in a similar manner to Boohemoth in New Super Mario Bros. 2.[3] In Light-Switch Mansion, King Boo appears once the Wonder Flower is collected and the Wonder Effect "A Night at Boo's Opera" is activated. King Boo then chases the player(s) through the level while singing with an operatic baritone voice. If he is looked at, he will cover his face and continue singing, albeit with a voice distortion filter. Once the Wonder Seed is collected, King Boo's crown will fall off as he shrinks into a regular Boo.[4] In The Final Battle! Bowser's Rage Stage, King Boo appears once the player(s) reach the Jack-o-Lantern pumpkins, acting as he does in the other level. Once players enter the zero-gravity section, King Boo again loses his crown and shrinks into a regular Boo, although he floats away off-screen surrounded with music notes.[5]

Mario Baseball series

Mario Superstar Baseball

King Boo is a default playable character in Mario Superstar Baseball and appears as a member of Wario's baseball team, the Wario Greats. As a Power type character, he is capable of hitting long outfield drives and even home runs. However, like Boo, his hits are usually very curved, resulting in hitting fouls plenty of the time. Aside from good batting, King Boo has average pitching and fielding, and is a slow runner. His ability is Super Jump, allowing him to catch high balls in the outfield. King Boo has good chemistry with Boo and Petey Piranha, and he has bad chemistry with Luigi and Baby Luigi. Additionally, he wields a Boo-like baseball bat that sports a physical crown on the end of it.

Mario Super Sluggers

King Boo prepares to bat in Mario Super Sluggers.
King Boo batting at Yoshi Park at night in Mario Super Sluggers

King Boo returns as a default playable character in Mario Super Sluggers. He is once again a default member of Wario's team, the Wario Muscles, making him and Boo the only team players to still be on Wario's team, alongside the captain Wario and sub-captain Waluigi. He has similar stats to the previous game, although his pitching is improved and matches his batting power. As well, his ability is now Teleport, which activates during close plays, allowing him to teleport safely onto the base when successful. In this game, he has good chemistry with Petey Piranha, Boo, Wiggler, and King K. Rool, but he has bad chemistry with Mario, Luigi, Yoshi, Baby Mario, Baby Luigi, Baby Peach, and Baby Daisy. His baseball bat also no longer has a physical crown on it, instead having a crown emblem above the Boo emblem on his bat. Additionally, in this game only, the colors of the jewels on King Boo's crown are reversed.

In Challenge Mode, King Boo appears immediately after the player defeats Bowser Jr. at the Wario City stadium, stating that he turned invisible and was watching the whole game. However, he is uninterested in joining the player's team unless the team has some Boos with them. This is accomplished by both recruiting Boo and finding the Mini Boo item.

Super Princess Peach

King Boo vs. Princess Peach
Princess Peach battling King Boo in Super Princess Peach

King Boo aids Bowser in Super Princess Peach by appearing as the boss of Shriek Mansion. After adventuring through Vibe Island, Peach discovers where King Boo is and engages him in combat. During the battle, King Boo fires blue homing fireballs at Peach and chases her regardless of whether she looks at him or not. Peach can damage King Boo with direct light, which is made by having his own flames light the candles spread throughout the room. After a few attacks, King Boo uses his Gloom vibe, which causes him to cry, which extinguishes the candle flames. After enough attacks, King Boo is eventually defeated. With King Boo eliminated, Peach rescues the Toad and continues against Bowser's forces.

Mario Party series

Mario Party 8

In Mario Party 8, King Boo gives out Stars on his own board King Boo's Haunted Hideaway. He hides in one out of three altars and gives the player a Star for ten coins if they can find him where he is hiding. If the player is able to buy the Star, he starts to "summon the bizarre" and disappears, causing the player to jump into a Warp Pipe that returns them to the starting point. This "makeover mojo" causes the whole layout of the course to change. However, if they do not have enough coins, King Boo causes a pitfall to appear under the player, causing them to return to the starting point and allowing the next player that reaches him to buy the Star. Additionally, if the player fails to steal anything from the board event Pickpocket Pinball, the hosting mouse sounds like King Boo. The player can purchase King Boo sounds from the Fun Bazaar, along with a figurine titled "King Boo's Revenge". When the player presses A Button on the figurine during the Figurine Parade, King Boo floats up and gives off a brilliant glow, as if he is a light bulb.

Mario Party 9

King Boo's Puzzle Attack
King Boo in his boss minigame in Mario Party 9, King Boo's Puzzle Attack

King Boo appears as the stage boss of the board Boo's Horror Castle in Mario Party 9. He is fought in the minigame, King Boo's Puzzle Attack, where the competitors line up power-ups in lines of three or more to deal damage to him. Once his health reaches halfway, he throws Boos onto the field which can stun the player's cursors, making them unable to move until they shake the Boo off. What is unique about his boss battle is that if a player gets the Final Attack, they get ten points instead of the usual three, likely because the players can easily accumulate points up to fifty. In the final fight against Bowser, King Boo can also appear to hinder the players' progress. If Bowser throws the die with all the stage bosses' faces on it and King Boo's face appears on top, King Boo materializes above the stage. Then, he summons five Boos that move in a counterclockwise direction while moving outwards. When the Boos reach the boundaries of the stage, King Boo summons another five Boos, except this time they move clockwise. After that, King Boo disappears from the battle unless his face appears on the top of the die again.

Like most other characters in the game, King Boo has a constellation that can be returned to the sky; it is called the Ghost Major. It is located in the farthest left portion of the sky, near King Bob-omb's constellation and right next to Boo's constellation. Like all constellations, it can be bought for fifty Minigame Points. Also, in the Museum's Sound Test, there are two voice sounds with the name "King Boo's Entrance"; one is of King Boo and the other is actually of Boo.

Mario Party 10

Boss minigame from Mario Party 10; King Boo's Tricky Tiles.
King Boo in his boss minigame in Mario Party 10, King Boo's Tricky Tiles

King Boo in Mario Party 10 is a boss in the minigame King Boo's Tricky Tiles. In order to defeat him, the player must remember which platforms are false, and then run around until they can jump on a light switch (one is worth 3 points, and another worth 1 point). Like other bosses, King Boo gets angered after the players deplete his health halfway. The technique that King Boo uses is that he swaps Boos with platforms and he blocks the camera, so the player can't see the platforms very well and remember which ones are false. He can also be seen on the Luigi Board, which appears in the game's amiibo Party mode.

Mario Party: Star Rush

King Boo returns as a boss in Mario Party: Star Rush in his minigame, King Boo's Light Smite. In order to defeat him, players have to use Light Boxes which they need to carry over rotating platforms while evading Peepas. Once he loses half his health bar, the rotating platforms start moving faster and more Peepas appear, making it more difficult to reach the other side.

Mario Party Superstars

King Boo appears in Mario Party Superstars on Horror Land, replacing the Big Boo found on the original board.[6] He summons Boo lackeys to steal coins (for free) or Stars (for 150 coins) from all opponents who have any. As with the Big Boo in the original, he can only be encountered at night and only through a path that requires a Skeleton Key.

Mario & Sonic series

Mario & Sonic at the Olympic Winter Games

Mario races against King Boo in the Wii version of Mario & Sonic at the Olympic Winter Games.

In the Wii version of Mario & Sonic at the Olympic Winter Games, King Boo appears as the first and sixth (in Individual Festival mode only) rival. King Boo races the player in the Alpine Skiing Downhill event in both Individual and Group Festival modes but he only races the player in Giant Slalom in the Individual Festival mode, making him the only rival that can potentially be faced more than once. King Boo has no skis so he goes down the hill smoothly. If the player loses to him, the guide (either Cream or Toad) says that it is unfair because King Boo has no skis.

King Boo as he appears in the DS version of Mario & Sonic at the Olympic Winter Games

In the Adventure Tours mode in the Nintendo DS version, King Boo is the mid-boss of Polastraits. When the challenger approaches him, King Boo tells Mario/Sonic that he must race someone afraid of him. He selects Luigi and they must race in Giant Slalom. In this version, King Boo is transparent and the player can ski through him. He also appears slightly larger than in his other appearances.

Mario & Sonic at the London 2012 Olympic Games

King Boo in Mario & Sonic at the London 2012 Olympic Games
King Boo in The Ghostly Tower

In the Wii version of Mario & Sonic at the London 2012 Olympic Games, King Boo is one of the rival characters who can be found in the London Party mode, and when he is encountered, he challenges the player to the Dream Sprint event, with stickers being offered as a reward for beating him.

In the Nintendo 3DS version, King Boo appears in the Story Mode, where he helps guard the Phantasmal Fog at the Tower of London, and teams up with a Boo to challenge Sonic and Tails in Badminton (Doubles). When defeated, he and the Boo flee, and King Boo later appears at the opening ceremony for the games. A badge of King Boo can also be obtained from the badge machine.

King Boo is one of the three characters who appear as rivals in Mario & Sonic at the London 2012 Olympic Games but do not appear as playable characters in any version of Mario & Sonic at the Rio 2016 Olympic Games. The other two are Boo and Magikoopa.

Mario & Sonic at the Sochi 2014 Olympic Winter Games

King Boo appears in Mario & Sonic at the Sochi 2014 Olympic Winter Games as a rival in the Legends Showdown mode. He appears in Area 4 and challenges the player in Short Track Speed Skating 1000m.

Mario Golf: World Tour

King Boo and Boos in Mario Golf: World Tour.
King Boo in Mario Golf: World Tour

King Boo appears in Mario Golf: World Tour on Hole 4 of Bowser's Castle. He is floating in the background alongside other Boos, and he is also much larger than in other games. His name can also appear on the tournament scoreboard.

Super Smash Bros. series

There are a few items of King Boo in the Super Smash Bros. series. In Super Smash Bros. for Nintendo 3DS, there is a trophy of King Boo. In Super Smash Bros. Ultimate, King appears in his Luigi's Mansion: Dark Moon design as an Advanced-class Neutral-type primary spirit, which is enhanced from the Boo spirit after it has reached level 99. When equipped, the spirit grants the fighter slower fall speed after jumping and has 3 support slots. King Boo is listed as the 49th spirit, though he was listed as the 121st spirit alongside the rest of the spirits from the Luigi's Mansion series in version 1.0.0.[7]

Puzzle & Dragons: Super Mario Bros. Edition

King Boo appears as a boss and enemy in Puzzle & Dragons: Super Mario Bros. Edition, mostly appearing at the Ghost House courses. His main attribute is Dark, while his sub-attribute is Light. As an ally, King Boo's skill can heal 1000 HP, and change all Heart Orbs into Dark Orbs. His Awoken Skill raises the amount of time that the player has to move Orbs around.

As an enemy, King Boo is capable of decreasing the player's maximum time to move Orbs around. Also, King Boo is treated as a generic enemy, so he can still appear as an enemy, regardless of whether or not the player has King Boo in their party. Big Boo can be transformed into a King Boo with six Boo Mushrooms as a Transformation Item, making it possible to create multiple King Boos on the player's team.

When King Boo attacks, a bunch of Boos attack with him.

King Boo's best stats are his ATK and RCV, while his HP is at an average level.

Mario & Luigi: Paper Jam

“Look at this little scrap. Friend of yours, is he? Well, if you like your friend, you better stop attacking me! Now, don't go thinking it's OK to attack my little minion either. Who knows what could happen if he dropped your little friend there... You got that?”
King Boo, Mario & Luigi: Paper Jam
King Boo from Mario & Luigi: Paper Jam
King Boo, attempting to fool Mario and Luigi by disguising himself as Paper Mario, in Mario & Luigi: Paper Jam

King Boo appears as a boss in Mario & Luigi: Paper Jam. King Boo has a papercraft version of himself piloted by Morton and Lemmy, which is fought in Bowser's Castle. The Mario Bros. use Papercraft Yoshi to fight it.

The real King Boo is encountered and fought in Gloomy Woods after the trio separate, leading to him kidnapping Mario and Paper Mario; leaving Luigi alone to find them, like in the Luigi's Mansion series. After finding Mario, he and Luigi begin to look for Paper Mario. They eventually find King Boo instead, disguised as Paper Mario. When they group together, King Boo reverts back to normal and laughs at the Bros. for a second, before re-transforming; Mario and Luigi then turn around, and are unaware of King Boo's presence. When they turn around again, King Boo reveals himself again, but is caught by the duo. In an attempt to fool them, he immediately reverts back to Paper Mario, and tries to convince the Bros. that he is the real Paper Mario, but fails. King Boo then loses control of his transformation powers, as he quickly transforms into Paper Peach and then Paper Bowser, before finally gaining control and giving up; reverting back to his true form, causing the battle to commence.

King Boo attacks by spitting blue fireballs at either Mario or Luigi before inhaling them; making them need to avoid the fireballs twice, and splitting into five copies before floating slowly towards the trio, turning invisible as he gets near; which the trio must counter using their hammers around 2 seconds after a copy turns invisible. During the battle, King Boo calls a Paper Boo holding the real Paper Mario onto the battlefield; threatening to harm Paper Mario if the bros attack either himself or the Paper Boo. In order to save Paper Mario, Mario and Luigi must defeat the minion holding onto Paper Mario, causing it to drop him. If King Boo is attacked while the Paper Boo is on the battlefield, he deals damage to Paper Mario. After a few turns, another Paper Boo can grab Paper Mario again, taking him out of the battle (which gets rid of Paper Mario's copies) temporarily. Finally, King Boo also has a chase attack where he grows bigger before attempting to shoot a giant blue fireball at the trio; which Mario and Luigi have to counter by throwing Paper Mario's boomerang form into King Boo's mouth while it is open. Once defeated, Paper Mario is reunited with the duo and the group continues to Mount Brrr.

Due to his crown, King Boo is immune to the brothers' Jump attack (but he can be hit by Hammer attacks, unlike Paper Boos) and certain Bros. Attacks, such as the Rocket Blast and Mega Thwonk's jumping attacks (only in the arcade). Attacking King Boo using attacks from above results in the Bro. taking 1 damage as if they were jumping on a spiked enemy. The Dropchopper, however, can circumvent this as it can be aimed towards King Boo's forehead instead of his crown and can then damage him.

The splitting attack used by King Boo is a reference to (if not a direct copy of) the Dark Star's splitting attack in Mario & Luigi: Bowser's Inside Story, except King Boo takes damage if countered unlike the Dark Star's version due to it being invincible. As well, if the Mario Bros. continue to attack King Boo without freeing Paper Mario, his slapping Paper Mario may be an allusion to Lady Bow and her slap attacks[8]. Also, King Boo's voice clips from Mario Kart Wii are reused.

Mario + Rabbids Kingdom Battle

King Boo makes a cameo appearance in Mario + Rabbids Kingdom Battle in Spooky Trails, where an image of him can be found on the ground in the area where the gramophone is found.

Mario Tennis Aces

King Boo appears in Mario Tennis Aces as part of the Boo Hunt Co-op Challenge available from version 2.0.0. When Frenzy Time is active, King Boo appears and hovers around the court. Players can continuously hit tennis balls at him to earn more coins. He disappears once either his health bar or the Frenzy bar is depleted. In this appearance, he does not use any of his normal voice clips, instead using those of a regular Boo.

Dr. Mario World

Dr. King Boo artwork from Dr. Mario World
Dr. King Boo in Dr. Mario World

King Boo appears in Dr. Mario World as assistants, added on November 14, 2019.[9] He is a battle box-exclusive assistant, only obtainable from battle boxes for tier 7 or above in versus mode. In versus mode, he has a chance of sending 2 extra rows of viruses to the opponent if the attack lands. In stage mode, he grants a chance of 5 extra capsules being added when 5 capsules are remaining, which will have a chance to activate again if the condition is met again but didn't activate earlier. However, it won't activate for the rest of the stage if this effect has successfully activated.

He also appears as a doctor named Dr. King Boo, available September 28th, 2020. Like Dr. Dry Bowser, he cannot be obtained in staffing and must be obtained through either in-app purchases or unlocking him through rewards such as in World 20's Special Stage or through certain referrals. His skill is to eliminate an amount of viruses even those that would normally take multiple hits to clear such as floatie viruses. In stage mode, the amount is 5 viruses (4 prior to version 2.2.0), while in versus mode, the amount differs based on level, where it is 4 at level 1 with three extra viruses per level, up to 16 at the maximum level of level 5. In stage mode, if there are no more viruses while this skill is activated, it will eliminate one random object that can be eliminated instead, excluding capsules.

The Super Mario Bros. Movie

King Boo has a minor appearance in The Super Mario Bros. Movie at Bowser and Peach's wedding with his Super Mario design. He is seen sitting a few rows behind King Bob-omb. He does not have any role in the climax nor does he speak. He disappears once Peach, Mario, and Donkey Kong crash the wedding. Compared to his usual design, his face is smaller and is more expressive, taking up less space on his overall body and somewhat resembling that of the Super Mario Sunshine King Boo. He is also the only Boo that appears in the movie.

General information

Physical appearance

King Boo's Super Mario design (left) and his Luigi's Mansion design (right)
King Boo's Super Mario design (left) and his Luigi's Mansion design (right)
King Boo's Super Mario design (left) and his Luigi's Mansion design (right)

King Boo has had two distinct appearances throughout his video game history. In most Super Mario games since Mario Kart: Double Dash!!, King Boo resembles a normal Boo with a golden, five-pointed crown, though he is much larger. With this design, the crown has a blue jewel on the front and four red jewels around the sides in every game except Mario Super Sluggers, where the colors are reversed. Like other Boos, King Boo is generally shown with an open, wide grin; however, when looked at, he closes his mouth and bashfully hides his face with his hands. In certain games like Mario Party 9, King Boo's emotions are denoted by an aura surrounding him: when happy, he glows with a blue aura, and when angry, he glows with a red aura. Sometimes he also has steam coming out of him to display his anger. In Dr. Mario World, he has a doctor's mirror on his crown and he carries a medicine box by strap. His gold variant in Mario Kart Tour is based on this design, and has an entirely golden body similar to a Gold Boo, though his teeth and tongue are golden as well. His crown is silver and all five jewels are blue.

King Boo's other design was first used for his debut appearance in Luigi's Mansion, and has since been reused in the subsequent Luigi's Mansion games. This original design gave King Boo dark red eyes, a blue tongue, two vampire-like fangs, a greenish complexion, and a ruby in a gold, round-edged crown. He is also roughly the same size as other Boos. Starting with Luigi's Mansion: Dark Moon, this design was slightly modified, giving him a full row of four teeth and a larger size typical of King Boo's modern design. Other differences include a larger shadow surrounding his eyes, a dark indigo mouth and tongue, and his crown containing a purple jewel and pointed edges. His artwork depicts him with purple eyes instead of red, its color in-game, and without his crown's pointed edges. He has also lost his original green tint, now being more of a lavender color. In Luigi's Mansion 3, King Boo shows more expression, scowling at Luigi when first being found by him and appearing visibly disappointed when captured in the game's credits. He also has purple eyes in-game. His speech icon also uses a green shading reminiscent of his initial appearance, while his portraits show him with a purple crown. In Mario Kart Tour, King Boo's Luigi's Mansion variant uses this design, although his tongue is more purple than indigo.

Personality

King Boo, looking at Luigi from Luigi's Mansion: Dark Moon
King Boo shows a particular disdain for Luigi in the Luigi's Mansion series.

King Boo is a sadistic villain who enjoys scaring and tricking his enemies by creating illusions and then overpowering and trapping them. King Boo often taunts Luigi and E. Gadd. In Luigi's Mansion 3, for instance, King Boo mocks Mario and Luigi's Italian accent by saying, "It's-a me, King Boo!", and in Luigi's Mansion: Dark Moon he pretends to confuse between Luigi and Baby Luigi. In Mario & Sonic at the Olympic Winter Games, he insists on racing against Luigi, knowing how afraid he is of ghosts. King Boo also holds grudges, referring to his prior defeat in Luigi's Mansion sarcastically as "Good times" and he has stated that he is "sick to double death" of Luigi. In frustration, he recites the noise of the Poltergust 3000, which he refers as a "disgusting machine", capturing him.

King Boo admires paintings and other decorations, such as making lengthy comments on how good Mario is as a painting; E. Gadd also comments that King Boo has decorated Treacherous Mansion to be scarier. He also desires to trap Luigi and E. Gadd through similar means.

King Boo boasts frequently about himself. He always proclaims his success in escaping, and he claims he fears nothing except the Poltergust 3000, although in Super Mario 64 DS he admits that Wario's face scares him. In the Mario and Sonic series, Mario & Sonic at the Olympic Winter Games, he claims that he is unbeatable at the Alpine Skiing event. Despite his power, he still covers his face in fear when looked at, much like a normal Boo. King Boo has a distinct cackle, which is quite lower in pitch than other Boos.

Powers and abilities

In Luigi's Mansion, King Boo's power increases when he is in the presence of other Boos. For example, King Boo can blow Luigi to the Foyer when enough Boos are in the mansion. King Boo can also materialize things, including pulling a mansion out of the ghost dimension, creating replicas of some of Mario's enemies, other Boos, dimensions to battle in, bubbles, and blue fire (which he spits out of his mouth). King Boo can regenerate from his crown in Super Princess Peach

In Luigi's Mansion: Dark Moon, King Boo can open paranormal portals to the ghost dimension, create traps such as sand patches, electrify terrain to shock Luigi, grow to large sizes, and teach Boos how to create Spirit Balls. His new crown can also shoot an ectoplasmic laser that can shatter the Dark Moon or trap Toads within paintings. King Boo can create illusions, hence his title "The Master of Illusions." In this game, similar to Luigi's Mansion, his power is stronger when there are other Boos in the vicinity.

Luigi fighting King Boo on the Rooftop
King Boo can create clones and shoot fireballs from his crown in the final battle of Luigi's Mansion 3

In Luigi's Mansion 3, King Boo summons magical paintings to trap people and, to a certain extent, objects inside. He can enlarge portraits in order to capture people, as an extension of his paranormal portals. He does not need the presence of other Boos to grow stronger in this game.

King Boo has a high power stat in many of his spin-off appearances. This is most noticeable in the Mario Baseball series, where he is able to hit home runs easily. His great strength is also shown in Luigi's Mansion: Dark Moon, as he summons and makes spike balls fall down simply by slamming the platform.

In Mario & Luigi: Paper Jam, King Boo shapeshifts to trick Mario and Luigi by posing as Paper Mario, and he later briefly transforms into Paper Peach and Paper Bowser. He can also spit blue fireballs.

Relationships

Enemies

King Boo and Luigi are arch-nemeses in the Luigi's Mansion games. King Boo's motivation for trying to imprison Mario and Luigi is for revenge that both brothers have posed trouble against him in the past. King Boo additionally dislikes Professor E. Gadd for his ghost-capturing hobby, involving capturing his Boos. King Boo additionally states that the only thing that scares him is E. Gadd's invention, the Poltergust 3000. In Mario Superstar Baseball, King Boo has negative chemistry with Luigi and Baby Luigi; in Mario Super Sluggers, he has bad chemistry with Mario, Princess Peach, Princess Daisy, Baby Mario, Baby Peach, Baby Daisy, and Yoshi. King Boo also traps Toads in Luigi's Mansion: Dark Moon and captures Princess Peach in Luigi's Mansion 3.

Generally speaking, King Boo cares nothing for ghosts that are not Boos, considering them expendable to advance his grand schemes such as in Luigi's Mansion: Dark Moon where he caused friendly ghosts to turn hostile so he can try to take over Mushroom Kingdom. Even Hellen Gravely, who has great admiration for King Boo, is seen by him as nothing more than a tool for his plans, and he is quick to dismiss her as useless once she fails to capture Luigi.

Friends

Bowser's Block Battle
King Boo assists Bowser by summoning Boos in Mario Party 9.

King Boo has been shown to work with Bowser on numerous occasions, including Super Mario 64 DS, Mario Party 9, and Super Princess Peach. He also used a Bowser decoy and the two share a portrait after King Boo's defeat in Luigi's Mansion. Despite this, the two share neutral chemistry in Mario Superstar Baseball and Mario Super Sluggers, with King Boo appearing on Wario's team rather than Bowser's. King Boo has also been paired up with Petey Piranha in Mario Kart: Double Dash!!, with the two sharing chemistry in the Mario Baseball games. King Boo also has good chemistry with Wiggler and King K. Rool in Mario Super Sluggers. Luigi's Mansion 3 shows Hellen Gravely admiring King Boo, with her releasing him to impress and aid him in his plot for revenge against Luigi. However, her admiration is entirely one-sided as King Boo pays little consideration toward Hellen Gravely and is more interested in capturing Luigi and E. Gadd.

King Boo also relies on his Boo minions (even outright referring to them as his friends in Luigi's Mansion), which cooperate to try to capture Luigi and his friends. In Luigi's Mansion, he frees Boolossus from Professor E. Gadd, and in Mario & Luigi: Paper Jam, he threatens to hurt Paper Mario if the Mario Brothers hurt his Paper Boo minion. He has good chemistry with the playable Boo in the Mario Baseball series. In Mario Super Sluggers, King Boo says that he finds little Boos cute. However, in the later Luigi's Mansion titles, he can be just as cruel to them as he is to his other ghost minions, showing no concern for them being sucked up by Luigi and even actively putting them in harm's way, as well as indirectly calling them useless in the latter game.

Quotes

Main article: List of King Boo quotes
  • "Aahh, I could just stare at my Mario painting for hours! It's true what they say about fine art...it takes utterly refined sensibilities to truly appreciate it! The way you plead for help, Mario... I find it so...satisfying. Perhaps that is merely because I remember how much trouble you've caused me in the past. ... Seriously, though, who would actually believe that mansions get given away in contests?! Talk about stupid! What do they feed you Mario brothers anyway...gullible soup? Your brother came all this way just to get turned into a painting... It's just terrific. However... This Mario painting looks lonely... I must have a Luigi painting as well! Then my gallery will truly be complete! Bleah HA HA! I am not afraid of you, fool! I fear only that infernal Poltergust 3000 you carry on your back! Stupid machine! But I am a KING among Boos! I swear it... I shall fear no mere house-cleaning device!! I must say...I despise the way you SHWEEERRPP-SHLOOOOP-WHOOORPP-SHLEEEOOORG-vacuumed up all my friends! Don't imagine that I'll flee... I'll fight you like a true Boo! Now join your brother... ...inside the painting!" - Luigi's Mansion
  • "Bah! You don't have enough coins! King Boo says boo to you! And good-bye!!!" - Mario Party 8
  • "Say WHAT? You want ME to help YOOOOOU?" - Mario Super Sluggers
  • "Heh heh heh! I saw that Alpine Downhill event of yours yesterday! Looks like you need to take a lesson in speed from ME! And that lesson starts today! I challenge you to an Alpine Downhill match! Hee hee hee!" - Mario & Sonic at the Olympic Winter Games (Wii)
  • "...Hmm? One-two-three-four-five-six-sev-- WAIT! There should be seven! Who's missing!? [...] Luigi! What are you doing over there?! UGH! That's it! I'm sick to double death of you! You want to fight me? FINE! Let's go, Luigi! This is the end for you, once and for all! HERE I COME!" - Luigi's Mansion 3

Voice samples

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Profiles and statistics

Main article: List of King Boo profiles and statistics

List of appearances

# Title Role Release date Format

1 Luigi's Mansion Main antagonist, final boss 2001 Nintendo GameCube
2 Mario Kart: Double Dash!! Unlockable playable character 2003 Nintendo GameCube
3 Super Mario 64 DS Boss 2004 Nintendo DS
4 Mario Superstar Baseball Playable character 2005 Nintendo GameCube
5 Super Princess Peach Boss 2005 Nintendo DS
6 Mario Kart DS Boss in Mission Mode 2005 Nintendo DS
7 Mario Party 8 Non-playable character 2007 Wii
8 Mario Kart Arcade GP 2 Cameo 2007 Arcade
9 Mario Kart Wii Unlockable playable character 2008 Wii
10 Mario Super Sluggers Playable character 2008 Wii
11 Mario & Sonic at the Olympic Winter Games Rival 2009 Wii, Nintendo DS
12 Mario & Sonic at the London 2012 Olympic Games Rival 2011, 2012 Wii, Nintendo 3DS
13 Mario Party 9 Boss 2012 Wii
14 Luigi's Mansion: Dark Moon Main antagonist, final boss 2013 Nintendo 3DS
15 New Super Luigi U Cameo 2013 Wii U
16 Mario & Sonic at the Sochi 2014 Olympic Winter Games Rival 2013 Wii U
17 Mario Golf: World Tour Non-playable character/cameo 2014 Nintendo 3DS
18 Super Smash Bros. for Nintendo 3DS Trophy 2014 Nintendo 3DS
19 Mario Party 10 Boss 2015 Wii U
20 Puzzle & Dragons: Super Mario Bros. Edition Boss 2015 Nintendo 3DS
21 Mario & Luigi: Paper Jam Boss 2015 Nintendo 3DS
22 Luigi's Mansion Arcade Main antagonist, final boss 2015 Arcade
23 Mario Party: Star Rush Boss 2016 Nintendo 3DS
24 Mario Kart 8 Deluxe Playable character 2017 Nintendo Switch
25 Mario Kart Arcade GP DX Playable character (during a limited-time event)
Unlockable playable character (for permanent use, through a limited-time event)
2017 Arcade
26 Mario + Rabbids Kingdom Battle Cameo 2017 Nintendo Switch
27 Mario Tennis Aces (version 2.0.0) Boss 2018 Nintendo Switch
28 Luigi's Mansion Main antagonist, final boss 2018 Nintendo 3DS
29 Super Smash Bros. Ultimate Spirit 2018 Nintendo Switch
30 New Super Mario Bros. U Deluxe Cameo 2019 Nintendo Switch
31 Dr. Mario World Assistant (update) 2019 iOS / Android
32 Mario Kart Tour Unlockable playable character (update) 2019 iOS / Android
33 Tetris 99 Cameo in TETRIS x Luigi's Mansion 3 Event 2019 Nintendo Switch
34 Luigi's Mansion 3 Main antagonist, final boss 2019 Nintendo Switch
35 Mario Party Superstars Non-playable character 2021 Nintendo Switch
36 Mario Kart Live: Home Circuit (version 2.0.0) Non-playable character 2021 Nintendo Switch
37 Super Mario Bros. Wonder Enemy 2023 Nintendo Switch

Gallery

For this subject's image gallery, see Gallery:King Boo.

Names in other languages

Main article: List of King Boo names in other languages
Language Name Meaning
Japanese キングテレサ
Kingu Teresa
King Boo

Chinese (simplified) 害羞幽灵王
Hàixiūyōulíng Wáng
嘘嘘鬼王 (prior to Super Smash Bros. Ultimate)
Xūxūguǐ Wáng
King Boo

King Boo

Chinese (traditional) 害羞幽靈王
Hàixiūyōulíng Wáng
幽靈皇[10] (Super Mario Bros. Wonder)
Yōulíng Huáng
King Boo

Ghost King

Dutch King Boo
Koning Schrik (New Super Luigi U)
-
King Fright
Estonian Kuningas Boo[11]
King Boo
French Roi Boo
King Boo
German König Buu Huu
König Boo (Mario Kart DS)
King Boo
King Boo
Hungarian King Boo[12]
-
Italian Re Boo
King Boo
Korean 킹부끄
King Bukkeu
King Boo; bukkeu comes from 부끄부끄 (bukkeubukkeu), Boo's Korean name

Latvian Karalis Bū[13]
King Boo
Lithuanian Boo[14]
-
Portuguese Rei Bu
King Boo
Romanian King Boo[15]
Regele Boo[15]
-
King Boo
Russian Бу-король
Bu-korol
Король привидений (Luigi's Mansion: Dark Moon official website)
Korol' privideniy
King Boo

The king of ghosts

Serbo-Croatian Kralj Boo[16][17][18][19]
King Boo
Spanish (NOA) Rey Boo
Rey Bú (2011–2017)
King Boo (Mario Kart Wii)
King Boo
King Boo
-
Spanish (NOE) Rey Boo
King Boo

Trivia

  • When King Boo says, "I will not give up my favorite decoration. I like Mario just where he is," he references a quote from Star Wars Episode VI: Return of the Jedi, when Jabba the Hutt says, "I will not give up my favorite decoration. I like Captain Solo where he is."
  • King Boo's laugh originating from Luigi's Mansion is actually a pitched-up version of a stock laughing sound effect.[20] A pitched-down version of the same effect was previously used for Bleak.

References

  1. ^ ProsafiaGaming (October 30, 2019). Luigi's Mansion 3 - All Endings & Ranks + Credits. YouTube. Retrieved November 20, 2019.
  2. ^ "(Luigi’s being held captive by King Boo, so you’ll have to rescue him first.)" – February 2005. Nintendo Power Volume 188. Nintendo of America (American English). Page 79.
  3. ^ Nintendo 公式チャンネル (September 28, 2023). スーパーマリオブラザーズ ワンダー CM ワンダー篇. YouTube (Japanese). Retrieved September 28, 2023.
  4. ^ YTSunny (October 19, 2023). Super Mario Bros Wonder - All Songs / Music Levels. YouTube (English). Retrieved November 4, 2023.
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