Bowser Jr.

"Someday, when I'm bigger, I wanna fight that Mario again!"

- Bowser Jr.

Bowser Jr. (sometimes written as Bowser Junior) is Bowser's eighth child. He is the youngest of Bowser's eight children and the Koopa King's favorite offspring (at least, for the time being). His other seven children, who used to help Bowser's plots, have now grown up and sometimes conquered whole kingdoms themselves. Bowser Jr., on the other hand, is allowed to accompany his father in various schemes, such as Super Mario Sunshine and New Super Mario Bros.. Bowser Jr. seems to be the perfect son for Bowser, as he wants to do nothing but his father's will (i.e. kidnap Peach and destroy Mario). The evil king himself even shows emotions toward his new son, a side of Bowser that is rarely seen (However the Koopalings have never appeared in games socializing with Bowser and Bowser Jr., except in New Super Mario Bros. Wii, and he did not appear in the cartoons.)

Super Mario Sunshine
Bowser Jr. first appeared in Super Mario Sunshine as the game's main antagonist. Before the events of the game, Bowser Jr. somehow acquired the Magic Paintbrush, a special brush that can magically create sticky paint-like goop, from the scientist Professor E. Gadd. Bowser Jr is also in possession of a bandanna emblazoned with a logo resembling Mario's nose and face that apparently lets him assume the form of Mario. However, the appearance can only be a watery-blue color. Bowser Jr. uses this ability to assume the identity Shadow Mario. As Shadow Mario, Bowser Jr. painted magical graffiti all over the tropical resort Isle Delfino, framing Mario for the crimes.

At the same time, Mario, Peach, and Toadsworth were heading to the island for some much needed holidays. However, as soon as the Toad Express lands at the island's airstrip, Mario battles a Polluted Piranha Plant, using his new partner F.L.U.D.D., and then the Delfino Police arrest Mario. After his trial, Mario was found guilty of vandalizing the island and was punished with cleaning up the island with F.L.U.D.D. (which was also designed by Professor E. Gadd). As Mario begins cleaning Delfino Plaza, by cleaning up the Grand Pianta Statue, Princess Peach gets kidnapped by Bowser Jr. (in his Shadow Mario disguise). Mario manages to save Peach rather quickly, then chases Shadow Mario to Bianco Hills. His cleaning up confines through various regions of Isle Delfino, during which Shadow Mario kidnaps Peach again, this time while Mario was away from Delfino Plaza or buying a shine sprite at the boathouse.

Shadow Mario takes the Princess to Pinna Park, the island's theme park, which was occupied by Bowser's forces. The young Koopa jumps into the cockpit of the gigantic Mecha Bowser and waits for Mario's inevitable arrival. Like clockwork, Mario arrives and battles the mechanical monstrosity. After a long battle, Mario overcomes the powerful Mecha Bowser. Bowser Jr. then reveals his true identity. As it turns out, Bowser Jr. was told by his father that Princess Peach was his mother and that she was kidnapped by the "evil" Mario. As such, Bowser Jr. tried to frame Mario by tagging the island as the Mario look-a-like Shadow Mario. Thus, Mario would be put in prison and the young Koopa could rescue his "mama". With his origin revealed, Bowser Jr. escapes by converting what's left of Mecha Bowser into a hot-air balloon and flying it, with Peach in tow, to Corona Mountain, where his father has been relaxing.

However, Bowser Jr. does not stay with his father at the volcano, and continues to harass Mario in his Shadow Mario disguise. Bowser Jr. attempts to run off with Shine Sprites, F.L.U.D.D. nozzles, and even a Yoshi Egg, but he is eventually stopped by Mario every time. Eventually, after Mario defeats Shadow Mario in all of the main areas of the game, the path to Corona Mountain is revealed.

When Mario reaches the top of Corona Mountain, the final fight between Mario and Bowser Jr. begins. However, Junior is not fighting alone this time; he has his massive father to help him. The three fighters battle in an on sen high above the ground. As Mario and Bowser duke it out, Junior aids his father by firing Bullet Bills at their nemesis. Eventually, father and son are defeated and Mario escapes the volcano with Peach.

In the end, Bowser admits to his son that he deceived him. In a rare case of emotion, Bowser remorsefully tells Bowser Jr. that Peach is not his mother. However, Bowser Jr. admits he knew Peach was not his mother, and (even though his father tricked him) says he wants to fight that Mario again. Bowser, seeing so much of himself in his heir, smiles. Together, the two plot their next plan to defeat Mario and capture Peach, after relaxing for a certain amount of time.

Bowser Jr.'s first appearance was the last one to feature the Mario style bandanna.

New Super Mario Bros.
In New Super Mario Bros., Bowser and Bowser Jr. enact their new plan to kidnap Princess Peach and defeat Mario. While Bowser's forces occupied various regions, Bowser Jr. was sent to retrieve Peach. To do this, Junior summons a lightning cloud (possibly made by Lakithunder) to set fire to Princess Peach's Castle, causing Mario to go investigate and thus leaving Peach all by herself. As a result, the young Koopa tip-toes in and captures the Princess. As such, Mario gives chase, battling Bowser Jr. throughout the game. Junior acts a lot like the Boom Booms of Super Mario Bros. 3, as he is the sole mid-boss of the game's various worlds. Like Boom Boom, Bowser Jr. can be defeated with three jumps to the head.

In New Super Mario Bros., Bowser Jr. is the boss of every tower. His attack pattern depends on how he wears his bandanna. If it is hanging loose, Bowser Jr. will jump and charge at Mario and can be defeated by simple jump attacks. If he wears the bandanna over his mouth, Bowser Jr. will throw Koopa shells at Mario and duck into his shell whenever Mario comes near, preventing jump attacks from working. In this form, Mario has to hit Bowser Jr. with a Koopa shell before he can be jumped on. Fireballs and Blue Shells are also very effective against the young Koopa, no matter what appearance he takes.

During the events of the game, Bowser is the boss of the first world. However, the Koopa King falls into a pit of lava. As such, Bowser, in a sense, perishes and becomes a Dry Bones-like monster called Dry Bowser. While Bowser is a member of the undead, Bowser Jr. has to hold together the Koopa Troop in his father's place. Surprisingly, the Koopa Troop remains united under his leadership. Bowser Jr. even remains loyal to his. Instead of taking complete leadership of the kingdom, Bowser Jr. revives his father by throwing him into a pot filled with some form of magic potion, restoring the Koopa King to his former self, only this time, Bowser is much larger than before and more powerful.

In the end, Bowser Jr. and his resurrected father fight Mario in an epic battle for Princess Peach. However, like Super Mario Sunshine, both father and son are defeated, and Peach is saved once again. During the game's ending, Bowser Jr. is seen dragging his unconscious father across the ground, bringing him home so the two can plot against Mario for a second time. He also breaks the Fourth Wall at one point, roaring at the player.

Super Mario Galaxy
Appearing as the secondary antagonist, Bowser Jr. guards three of the Grand Stars in Super Mario Galaxy. He appears first in Bowser Jr.'s Robot Reactor, where he summons Megaleg to attack Mario. He later appears in Bowser Jr.'s Airship Armada in his small personal airship to fight Mario. He is also seen in Bowser Jr.'s Lava Reactor where he summons a more powerful King Kaliente to attack.

Bowser Jr. was not seen again until Mario reaches Bowser's Galaxy Reactor, where he is shown keeping Peach on his airship. While Mario marches up the steps to confront Bowser, Jr. fires cannonballs that collapse the steps. He then watches the final battle while keeping Peach. After Bowser is defeated, the Galaxy starts going haywire. Jr. falls out of his airship and falls into his father's sun. Later, however, he is shown alive and dancing back in the Mushroom Kingdom on a Airship in the water.

New Super Mario Bros. Wii
Bowser Jr. makes another appearance in the sequel to New Super Mario Bros.; New Super Mario Bros. Wii. This is the first game in which he appears along with Bowser's other seven children. As his father's apparent favorite child, Bowser Jr. seems to be leading the Koopalings in this adventure, and gets a Koopa Clown Car similar to that of his father, although it is smaller, instead of a magic wand like his siblings. In the beginning of the game, it is revealed that Bowser Jr. along with the Koopalings arrive to Princess Peach's castle on her birthday disguised as a birthday cake. Bowser Jr. and his siblings emerge and kidnap the Princess by loading her onto the airship. From there, the Koopalings (along with Jr.) make a flight to Bowser's castle via the airship with Mario, Luigi, Blue Toad and Yellow Toad closely following them in an attempt to rescue Peach. This is also the first game where he is shown to breathe fireballs. Unlike how Bowser Jr. is fought ten times in New Super Mario Bros., he is only fought three times; all three times being on an Airship.

In the first battle with Jr., he uses his Clown Car. He flies up and the only possible way to attack him is to use the Propeller Block in order to spin up to his height and jump on him. The Koopa King's son has finally mastered the art of breathing fire and when his fire hits the ground, it creates a large blaze there. He must be hit three times to be defeated.

In the second battle, he uses his much more broken Clown Car to battle. Luckily for Mario, he finds a Mario Car to use in combat. The Mario Car must be flown up by the player and used to knock Jr. into the electrical fence on the walls of the room. He must be hit three times to be defeated.

In the third battle, Mario Ground Pounds the floor upon entering the room, sending a wave through the floor that knocks over Jr.'s Clown Car. Bowser Jr. turns around and sees his father's Clown Car. Kicking his destroyed Clown Car aside, he jumps into the larger version. Using his father's Clown Car, Jr. drops large mines on the field. A ground pound must be used on the wavy floor to lob the mine back up and damage the Clown Car. Bowser Jr. can now fire more than one fireball in a row, and they create blazing obstacles on the floor. In addition, these fireballs can home in on Mario. He must be hit three times.

Bowser Jr. can can be seen in the ending, communicating with Larry Koopa, and the two watch their older siblings help their Dad. After lifting their unconscious father, he gets hoisted up and soon after, Bowser's Castle collapses towards them.

Super Mario Galaxy 2
Bowser Jr. makes an appearance in Super Mario Galaxy 2, aiding his father once again, as in the first game.

His first appearance in Bowser Jr.'s Fiery Flotilla is a brief one, where he summons Gobblegut to the battlefield for Mario's fight for the first Grand Star. He himself does battle with Mario and Yoshi later in the game by piloting the Megahammer robot, for the third Grand Star. Later, the Boomsday Machine is Jr.'s vehicle of choice, and guards the fifth Grand Star. Once Mario defeats Bowser Jr.'s Boomsday Machine, it explodes, sending Bowser Jr. flying into space. He is not seen afterward for the remainder of the game, and it's unknown what exactly happened to him.

The player faces Bowser Jr. up to four times in this game, with two of the fights being under the Daredevil Comet conditions.

Mario Golf: Toadstool Tour
Bowser Jr. is said to have spent the majority of his childhood practicing golf on his dad's private course, making him a skilled golfer. He uses these talents in Mario Golf: Toadstool Tour, where he is a hidden character. For some reason, Shadow Mario also is a playable character in this game. It is unknown if this Shadow Mario is an alternate form of Bowser Jr. or someone else donning the shadowy disguise. Perhaps, this Shadow Mario is Il Piantissimo, the tropical island racer who finds the Magic Paintbrush at the end of Super Mario Sunshine.

Mario Kart: Double Dash!!
Bowser Jr. appears as his father's partner in Mario Kart: Double Dash!!. Bowser Jr. is a lightweight, while his father is a heavyweight. The two make a deadly racing pair, as they can both use Bowser Shells to mow down opponents. Occasionally, this attack backfires, as the shell can ricochet backwards and hit the father and son team. His personal kart is the Bullet Blaster, which can be unlocked by winning the Special Cup in 50cc. In the manual, the reason why Bowser Jr. is in the race is because he had been misbehaving, and his father believes that this would set him straight.

Interestingly enough, while Bowser's Koopa King is very heavy (one of the three heaviest karts in the game), Bowser Jr.'s Bullet Blaster is very light (lightest kart in the game).

Mario Kart Wii
Bowser Jr. reappears as an unlockable character in Mario Kart Wii. He can be unlocked by getting at least 1 Star Rank in every Retro 100cc Cup. Unlike in Double Dash!!, he is a middle sized character and races solo, like everyone else in the game. Bowser Jr.'s stat bonuses only boost the off-road and mini-turbo stats by a small amount. Therefore, he has the smallest number of stat bonuses among all the playable characters in the game. Bowser Jr.'s emblem appears in several parts of the city in Moonview Highway.

Mario Power Tennis
Bowser Jr. appears as his father's doubles partner in Mario Power Tennis. The young Koopa can use the Magic Paintbrush to add power to his swings or confuse his opponents with tennis balls made of paint. Whether or not it's the same Magic Brush from Super Mario Sunshine is unknown.

Mario Baseball series
Bowser Jr. appears in Mario Superstar Baseball and Mario Super Sluggers where he is a powerful batter, but his running speed is a bit lacking. In these games, Bowser Jr. is shown to be left-handed (though there's an option to play right-handed).

In Super Sluggers, Jr. has his own stadium, which happens to be his own room. At night, it changes into Bowser's Castle. His Magic Paintbrush is his bat in Super Sluggers, which he uses to blind the batter with paint blotches or knocks the opposing team's members out with paint. In Challenge Mode, he is responsible for taking over all of the stadiums on Baseball Kingdom, only to be beaten in every stadium by Mario and the gang.

When Bowser is defeated for the second time, the other captains invite them to a celebration. Bowser refuses, but Bowser Jr. tells Bowser that he wants to have fun, which forces them to go (though the two only get a small portion of food).

Bowser Jr. had good batting and running abilities in Mario Super Sluggers, but his pitching was only average, and his fielding skills were pretty weak. His running is his best skill which upgrades his fielding abilities by far and his jumping almost matches Diddy kong's in height.

Mario Hoops 3-on-3
Bowser Jr. later appears as a playable character in Mario Hoops 3-on-3. Unlike his father, he is a default character. Jr. is a speedy character who slam dunks by whirling his arm around in a circle and then slamming the ball in. Bowser Jr.'s Super Shot is the Graffiti Dunk, which consists of Bowser Jr. using his Magic Paintbrush and covering the basketball in Graffiti and then hitting it towards the basket.

Mario Strikers Charged Football
Bowser Jr. is also an unlockable character in Mario Strikers Charged Football. He is an Offensive Captain, unlike his father, who is a Power Captain. Bowser Jr. is unlocked by beating the Fire Cup, which also involves beating Bowser Jr. as well. Bowser Jr.'s whining abilities are shown in this game where his screams reach supersonic levels. His Super Ability, Sonic Roar!, allows him to shrink all players he hits by using a large sound wave. His Mega Strike also uses sound waves. In this game, Bowser Jr. wears a collar similar to the one Bowser wears. His trademark bandanna, however, is absent.

Mario Party DS
Bowser Jr. made his Mario Party debut in Mario Party DS, where he helped his father in Story Mode, though he only has one line in the game. Bowser Jr. also appears in the Rocket Rascals mini-game occasionally to cause trouble.

Super Smash Bros. Brawl
Though Bowser Jr. was not a playable character or Assist Trophy, he made several cameos in Super Smash Bros. Brawl. He appears as a trophy that is based on his current appearance, and he is briefly mentioned in Bowser's trophy information. He also has several stickers depicting him from several games. Junior's artwork from Super Mario Sunshine is an attack type, medium sized sticker. It's area of effect is the tail and damage is +25. The only characters who can use it are Yoshi, Pikachu, Diddy Kong, and Pokémon Trainer. His second sticker is his artwork from Mario Superstar Baseball.

Mario & Sonic at the Olympic Winter Games
Bowser Jr. made his debut in the Mario & Sonic series in the second game installment, Mario & Sonic at the Olympic Winter Games. He is a well-rounded character, with stats more in favor of power and skill in the Wii version; his stats in the DS version, however, are more balanced, with power being his best stat. His special move is the same as his dads.

Mario Sports Mix
Bowser Jr. appeared as a speed character in Mario Sports Mix. His speed is very high, while having average power. However, his technique attribute is very low. He has his very own stadium called Bowser Jr. Blvd..

Character Description
Bowser Jr.'s skin tone is the same as most of the Koopalings, with the same yellow and tan skin complexion, as well as a light green head. Junior has one, fang-like tooth in the upper corner of the side of his snout. He also has a ribbed, padded stomach and padded feet. His mouth is wide, puffy, and convexed, with a large snout. He has small, circular eyes that are black in color. Junior has small spikes on each side of his head, each being circled with orange rings. Junior's hairstyle is a top-ponytail held by a metal hair-tie. It is fiery in both color and appearance, similar to his father's hair. He also has thick eyebrows of the same fashion.

Bowser Jr. is physically powerful like his father in spite of his small frame. His exact size varies from game to game like his father's, but he usually appears bigger than his older brother, Lemmy, and has a chubby frame similar to Ludwig's. He is shown to be fast, as well as skilled, though at times he may be given varied stats.

Jr. is portrayed as wearing few items of clothing, similar to his relatives. His main article of clothing is a white bib that's decorated with drawn-on fangs and worn like a mask. Rather than wearing the spiked cuffs the male Koopalings have, Jr. has spikeless, metal cuffs on his wrists. His shell design is very similar to his father's. Jr.'s shell is green, lined with a white encasing, and the multiple, short spikes are circled with orange rings.

Personality and Traits
Bowser Jr. can be summed up as a bold and energetic troublemaker. His trouble making side is seen as he tricks Mario in both Super Mario Sunshine and New Super Mario Bros. According to Mario Kart Wii, Bowser Jr. inherited his father's bad attitude, evident in his motto ("Grin and bear it. When that don't work, grin and crush it."). He is also bratty, spoiled, and short tempered, though in Mario Party DS it is stated he has a lonely side. His favorite hobbies are stealing cookies, causing trouble for people, and scribbling (which may explain the widespread graffiti that was made at Isle Delfino). However, he seems determined to defeat Mario in a fair fight in order to prove his power.

Bowser
Bowser Jr. idolizes his father and strives to be like him. Bowser tends to treat Bowser Jr. as a minion sometimes, but usually shows a bit more emotion towards him. When Bowser admits he conned Jr. in Sunshine, Jr. admitted he knew all along and forgave his father, showing how they trust each other. Bowser also never gets frustrated at his son when he fails, something that happens often with his other minions. While Bowser does care for his son, his selfishness and greed seems to overshadow this; in Super Mario Galaxy, Bowser grieved over the impending destruction of his galaxy rather than thinking about the welfare of his own son. Nevertheless, Bowser Jr. and Bowser have a very strong bond and are seen together as partners in various sports titles.

Koopalings
Bowser Jr.'s relationship with his brothers and sister is for the moment unknown. So far, it is known that he is the youngest and smallest of the eight children. He also ranks slightly above them, making the seven others technically subordinate to him (this does not stop some of them from abandoning him on the airship, which may be intentional or accidental). However, he is known to help them, by dropping them of at their respective castles in his airship as well as watching over them. The only scene in which he directly interacts with the other Koopalings is after the credits in New Super Mario Bros Wii, where he points a waking up Larry Koopa at the rest of the Koopalings, who are lifting up an unconscious Bowser, and they both proceed to help them.

Mario
"Someday, when I'm bigger, I wanna fight that Mario again!"

- Bowser Jr.

Bowser Jr. was told by his father Mario was evil, and took his "Mama" away. He has since been trying to cause Mario trouble, which brings him joy. But at the end of Super Mario Sunshine, Bowser tells his son that Peach really is not his mama. He has attempted twice to stop Mario by himself mainly, and has had help by his father in some ways, such as use of the Koopa Troop and weaponry.

Princess Peach
"I know, she's not really my Mama."

- Bowser Jr.

Bowser Jr. seems to have no mother, though he is seen wishing that Peach would play a maternal role in his life, shown when he called her 'mama' in Mario Superstar Baseball even though he knows she is not related to him. In his Brawl trophy it was revealed that the reason he had kidnapped her in Super Mario Sunshine and in New Super Mario Bros. was because he felt strongly about her. In  Super Mario Sunshine, Jr. tried to get Peach to join him and Bowser in their slime tub, but Peach politely refused the offer. In Super Mario Galaxy Jr. also kept Peach with him in his airship while Bowser fought Mario.

''Mario Kart: Double Dash!!

 * Partner: Bowser
 * Kart: Bullet Blaster
 * Special Item: Bowser Shell
 * Bio: "An energetic troublemaker who's ready to drive out of his father's shadow."
 * Bio2: "He may be smaller than his dad, but Bowser Jr. is just as mean and just as destructive. When he hurls Bowser's shell, he can cause some serious pain."

Mario Kart Wii
Bowser Jr. is an unlockable character in Mario Kart Wii. The player had to get a "one star" ranking or better in the 100cc Retro cups. He is a medium sized character.


 * Stats
 * Size: Medium
 * Actual Bonuses
 * Off-Road: +1
 * Mini-Turbo: +1

''Mario Hoops 3-on-3
Stats
 * Type: Speedy
 * Special Shot: Graffiti Shot
 * Bio: "He zigs and he zags! He's powerful like his dad! Better not underestimate Bowser Jr."

''Mario Superstar Baseball

 * Teams: Jr. Fangs, Jr. Bombers, Jr. Pixies, Jr. Rookies
 * Type: Power
 * Starting Team Captain: Bowser
 * Status: Secondary Team Captain
 * Stats:
 * Batting: 8/10
 * Pitching: 5/10
 * Fielding: 3/10
 * Running: 4/10
 * Player Profile:
 * Strong Point:
 * Special Talents: Body Check, Wall Jump
 * Trajectory:
 * Field: Center
 * Height: Top
 * Special Ball: Killer Jr. Ball
 * Default Batting Position: Right
 * Default Throwing Arm: Left
 * Sweet Spot: The Spike Ring on the bat
 * Compatible Relationships: Bowser, Magikoopa, Hammer Bro.
 * Bio: "Bowser's exuberant son. Bowser lied to him and convinced Jr. that Peach was his mom, resulting in a chaotic adventure for Mario and company. Bowser thinks the Koopa clan is in good hands with his son. He's not just powerful but also surprisingly skilled."

Mario Strikers Charged Football

 * Unlocked By: Clearing the Fire Cup
 * Character Type: Offensive
 * Super Ability: Sonic Roar!
 * Deke: Bowser Jr. jumps into the air and slams his shell into the ground.

Stats

 * Movement: 3
 * Shooting: 10
 * Passing: 10
 * Defense: 3

Super Mario Galaxy Bio
''Bowser Jr. has been causing trouble for Mario since they met at Isle Delfino, doing the bidding of his father, the great Koopa King Bowser. When Mario gives chase to Bowser across the universe, Bowser Jr. tries to intercept the plumber and make his father proud. But does the little Koopa underling have the guts to really stop the hero of the Mushroom Kingdom?''

Portrayals
Bowser Jr. is voiced by Dolores Rogers. For some reason, on Tara Strong's official website, the voice actress is said to have voiced Junior in Super Mario Sunshine, even though she is not listed in the game's credits. She however, voiced Bowser Jr.'s older brothers Hip and Hop on The Adventures of Super Mario Bros. 3 and the Super Mario World cartoon. In Mario Strikers Charged Football, Super Mario Galaxy, Mario Kart Wii, Super Mario Galaxy 2, and Mario Sports Mix, he is voiced by Caety Sagoian.

Quotes

 * "Leave my mama alone you bad man." – ''Super Mario Sunshine
 * "I won't let you take Mama Peach away!!" – ''Super Mario Sunshine
 * "You again? Don't you ever give up?" – ''Super Mario Sunshine
 * "This is my Magic Brush. When I draw with it, all my wishes come true." – ''Super Mario Sunshine
 * "You...You pest. Stop following us". – ''Super Mario Sunshine
 * "I know, she's not really my Mama." – ''Super Mario Sunshine
 * "Some day...when I'm bigger... I wanna fight that Mario again!" – Super Mario Sunshine
 * "Yes, I won!" – ''Mario Power Tennis
 * "This game stinks! It stinks-...IT STINKS!!" – ''Mario Power Tennis
 * "I'm coming. At every turn." – ''Mario Power Tennis
 * "This time, I won't even need my Dad's help to take care of you! – ''Super Mario Galaxy
 * "This calls for my ultimate weapon!" – ''Super Mario Galaxy
 * "Yay! I won! I WON!" – ''Mario Kart Wii
 * "What?! Lame! Lame. Lame." – ''Mario Kart Wii
 * "Let's go!"– ''Mario Kart Wii
 * "Oh, Mama! You're tough! But I'm tough too, right?" – ''Mario Superstar Baseball
 * "Wah ha ha! Ya know what you are? A buncha BUGS that I'm gonna SQUASH!" – ''Mario Super Sluggers
 * "Blech! Wario!" – ''Mario Strikers Charged
 * "Junior!" – ''Mario Sports Mix

Trivia

 * According to the Mario Power Tennis official website, Bowser Jr. resides at "48 Lava Cul-De-Sac, Magma Manor."
 * In Mario & Luigi: Partners in Time, Baby Bowser looks exactly like Bowser Jr. However, his bandanna is different.
 * Ironically, while his siblings were fought on Airships in Super Mario Bros. 3 and Bowser Jr. was fought in towers in New Super Mario Bros., they swapped roles in New Super Mario Bros. Wii, where Bowser Jr. is fought only on the Airships and the Koopalings are encountered in the towers of each world.
 * Bowser Jr. is the only one of Bowser's children who is not named after a real person, but rather, a fictional character.
 * Like his father, he seems to have an inconsistent size. He was smallest in Super Mario Sunshine and some spin-offs, but as of New Super Mario Bros. and its sequel he is roughly Mario's size. In Super Mario Galaxy he has grown considerably, towering over Princess Peach.
 * Bowser Jr. is never seen as an opponent in Mario Strikers Charged's Challenge Mode.
 * In New Super Mario Bros. Wii, Bowser Jr. always wears his bandanna on his face when in the presence of his siblings, never showing his face when around them. Coincidentally, these are also the only instances in the entire game where Bowser Jr. wears his bandanna in this manner.
 * Ever since Diddy Kong appeared in the Mario spin offs, Bowser Jr. also appeared along with him. However, while Bowser Jr. is in Mario and Sonic at the Olympic Winter Games, Diddy Kong is not playable for some reason. Likewise, Diddy Kong is in Super Smash Bros. Brawl, but Bowser Jr. isn't.
 * Bowser Jr. is left handed. This is because Shigeru Miyamoto prefers his left hand, and likes making left handed characters; Link is also left handed.
 * However, despite being a lefty, he appears on the right handed side of the batting field in Mario Super Sluggers.