King Boo

"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

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 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 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.

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 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 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.

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 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.

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.

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.

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.

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.

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.

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.

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.

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 and Wario) they defeated Bowser and saved Princess Peach.

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.

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, based on their race position). Of course, this means they possessed no unique special item of their own.

King Boo's personal kart is the Boo Pipes, which is basically a gray version of Petey's Piranha Pipes kart, but with an image of a Boo instead of a Piranha Plant.

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.

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 features a good handling bonus and a small off-road bonus, which comes in handy for vehicles like the Offroader, Wario Bike, and Phantom.

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.

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.

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 8
King Boo makes his first appearance in a 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.

Mario & Sonic at the Olympic Winter Games
King Boo appears as the first and sixth (In individual festival mode) rival in Mario & Sonic at the Olympic Games. King Boo races the player in Alpine Skiing Downhill in both individual and group festival modes but he only races the player in Giant Slalom in the individual festival mode. King Boo can fly and has not skis so he goes down the hill quite smoothly. If the player loses to him, the guide (either Cream or Toad) will say that it is unfair because King Boo has no skis. In Adventure Tours, King Boo blocks a path in Polastraits. When he is approached, he challenges Luigi to an Alpine Skiing Downhill race.

Traits and Abilities
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.

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.

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.

Physical Appearance
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, 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.

Boo Leadership
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 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).

Personality
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.

Trivia

 * 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.
 * In Mario Kart Wii, King Boo and Baby Mario are the only characters that get a good handling bonus.
 * 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.
 * 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 antagonists in the 3D Mario series games, with the other being Bowser.
 * Interestingly enough, in each of his three "adventure" games, he is fought by a different character. In Luigi's Mansion, Luigi fights him; in Super Mario Sunshine, Mario fights him; in Super Princess Peach, Peach fights him.

Official 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.''