Bowser Jr./Appearances

==In ==
===Super Mario Sunshine===
Bowser Jr. debuted in Super Mario Sunshine. In it, Bowser Jr. uses a magic paintbrush, invented by Professor E. Gadd, and a special kerchief to transform into a translucent blue doppelgänger of Mario, Shadow Mario, who vandalizes Isle Delfino, tricking the native people into believing that Mario himself is to blame. He does this to Mario because Bowser tells him that Princess Peach is his mother, and that Mario has kidnapped her. Bowser Jr. kidnaps her himself, and is eventually defeated along with Bowser. He realized that Princess Peach isn't his mother before Bowser decided to tell him, but he still refers to Peach as "Mama" sometimes in later games, such as when he challenges Princess Peach to a game in Mario Superstar Baseball. Bowser Jr.'s real mom is unknown.
===New Super Mario Bros.===
He is once again the main antagonist and kidnaps Princess Peach. He drags Peach around through different worlds as Mario chases him. In this game, Bowser Jr. is the boss of every tower acting a lot like Boom Boom of Super Mario Bros. 3.
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 bandana 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. Bowser Jr. also helps his father during the final battle of the game. At the end of the game, Bowser Jr. can be seen dragging his father to his castle. Bowser Jr. looks at the player who is watching, gets angry and then helped back to his father. Bowser Jr. doing this breaks the fourth wall as he knows about the player's existence.
===Super Mario Galaxy===
Bowser Jr. is a boss and also appears in the last level of three domes in Super Mario Galaxy. He appears first in Bowser Jr.'s Robot Reactor, where he summons Megaleg to attack Mario only for it to be promptly destroyed by the plumber, allowing him to recover the Grand Star powering it. In Bowser Jr.'s Airship Armada, he arrives in a tiny ship at the end of his airship and fires cannonballs while the player fights Koopa Troopas. If a Koopa's shell is thrown at his ship, he will start firing homing-Bullet Bills. Hit it again and a Magikoopa will appear. Hit it one more time and fireballs will start flying out from it. Three more hits and it explodes and Bowser Jr. gets away revealing another Grand Star. After apparently getting scolded by Bowser, he becomes determined to best Mario the next time in order to avoid his father's wrath.
Bowser Jr. is fought for a second time in his small personal airship.
In his third encounter at Bowser Jr.'s Lava Reactor, he summons a black King Kaliente to attack. He will first spit out three fireballs, followed by a coconut. The player must perform a spinning attack to whack it back at him, then the king will throw it back at Mario. If Mario whacks it at him three times with the coconut fly past him, he will knock the king's crown off. If it is missed, the attack pattern will repeat until Mario is successful while Jr was possibly punished for his failure.
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., he 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 jumping in the Mushroom Kingdom alongside an Octoomba.
As an additional note, Bowser Jr.'s theme in this game has a similar opening to the themes that play when Peach's castle is being lifted and during the final phase of the last fight against Bowser, but heavily sped up.
===New Super Mario Bros. Wii===
Bowser Jr. and the Koopalings hid in a cake during Princess Peach's birthday, and showed up by surprise and kidnapped the princess. He battles Mario on an airship in Worlds 4, 6, and 8.
In his first battle, he uses his new mini Koopa Clown Car and spits fireballs for the first time. When his fire hits the ground, it creates a large blaze there, the player must be careful not to land on these. 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. He must be hit three times to be defeated.
In the second battle, he uses his damaged Clown Car. Luckily, Mario finds a similar Car to use in combat. Mario's 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 either by the electric fence or on the head (or a combination) to be defeated.
In the third battle, Bowser Jr. uses his father's Clown Car since the one he had previously was broken. In battle, 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 3 times by bombs to be survive.
In the final scene of Peach, Mario, Luigi and Toads, a new scene opens with Larry down, tired while Mario, Luigi, Toads and Princess Peach are far away in the background. Then, Jr. appears and draws the attention of Larry, and points to Bowser overturned and the Koopalings helping him. Then Bowser gets back to normal, bringing joy to their children, but falls on his castle after all.
===Super Mario Galaxy 2===
Bowser Jr. reprises his role as the secondary antagonist where he aids his father. Like the previous game, Bowser Jr. will prevent Mario from reaching and fighting his dad, via summoning monsters and controlling machines. During his first encounter in Bowser Jr.'s Fiery Flotilla, Bowser Jr. summons a gargantuan dragon Gobblegut in order to fight Mario, but is easily defeated by the Italian plumber. Later in Bowser Jr.'s Fearsome Fleet, Bowser Jr. attacks Mario and Yoshi with a giant robot (Megahammer) and is easily defeated yet again. Finally, in a last attempt to extinguish Mario at Bowser Jr.'s Boom Bunker, Bowser Jr. uses a large battle tank called the Boomsday Machine. The machine attacks with spinning Fire Bars and by launching balls of electricity as Bowser Jr. guards the fifth Grand Star. After the third and final battle, Bowser Jr. is defeated for good where he gets launched into space. It's unknown what happens to him as he is not seen again for the rest of the game. Mario technically fights Bowser Jr. up to four times in this game, as two of the battles are the same ones but under Daredevil Comet conditions.
===New Super Mario Bros. U===
Bowser Jr. returns in the Wii U title, New Super Mario Bros. U, once again as the secondary antagonist. While the Koopalings have their own personalized airships. Bowser Jr. pilots the flagship, and is the boss of Soda Jungle and Meringue Clouds. In Soda Jungle's The Mighty Cannonship, Bowser Jr. uses his Clown Car as a submarine and uses it to fire Targeting Teds, and can be defeated by guiding the Targeting Teds at his Clown Car. After being defeated, Bowser Jr. uses the Mecha Hand to crush the heroes, but they jump out of the way and escape. In Meringue Clouds' Boarding the Airship, Bowser Jr. uses his Clown Car equipped with boxing gloves to destroy the blocks the player is standing on and throws Bob-ombs, which the players can pick up and throw at him. After his defeat, Bowser Jr. attempts to use the Mecha Hand to crush the heroes again only to damage the airship instead, forcing him to flee.
Bowser Jr. reappears in the last stage called The Final Battle, and in the main course, he slams his Junior Clown Car onto platforms to hinder the player's progress. After Bowser is beaten the first time, he uses his Clown Car holding Kamek to use his magic to revive Bowser and turn him gigantic. During the final battle, Bowser Jr. pilots his Clown Car, attacking by tossing Bob-ombs and slamming into the ground. The player must then jump on Bowser Jr. to kick him out of the Clown Car for the player to pilot it themselves and slam on Bowser's head. All the while Bowser Jr. will shoot fireballs at the saboteur. After smashing the Clown Car three times into Bowser's head, he falls off the castle, defeating him. The players then turn towards Bowser Jr., who decides to accept defeat and jumps off the castle.
In the ending cinematic, Bowser Jr. and the Koopalings make their escape on the badly damaged airship, only for it to crash when Bowser jumps onto it. Bowser Jr. is then seen flying away on his Clown Car, struggling to carry Bowser and the Koopalings clinging on the side.
===New Super Luigi U===
Bowser Jr. also makes an appearance in New Super Luigi U. He is the boss of the same levels and is battled the same way. He resides in Soda Jungle's All Aboard! and Meringue Clouds' Bowser Jr. Showdown.
===Super Mario Maker 2===
In Super Mario Maker 2, Bowser Jr. can be placed anywhere except the Super Mario 3D World style. His main attacks are breathing fire balls and Ground Pound (move), if the player gives him wings, he will be able to throw hammers and stay in the air longer before pouding the ground. However, he won't breathe fire balls and throw hammers if he is stomped on twice in a Junior Koopa Clown Car, instead, he will throw Koopa Shells.
===Super Mario 3D World + Bowser's Fury===
While absent in the original game, Bowser Jr. appears in the Bowser's Fury mode as an ally to Mario. After Bowser is corrupted by black paint, Bowser Jr. summons Mario to Lake Lapcat to help him defeat his father and stop his fury. He flies around in his Junior Clown Car and wields his Magic Paintbrush, which he can use to defeat enemies or bring powerups out of ?-marked walls. He can be controlled by the second player.
After Mario successfully defeats Bowser and turns him back to normal, Bowser Jr. held back his father when he still tried to attack Mario. Instead of thanking Mario for all he's done, Bowser Jr. simply roars at him before leaving. The end credits show that Bowser Jr. reflected his and Mario's adventure through paintings. After going back to see him afterwards, he continues to accompany Mario while he retrieves more Cat Shines, with the very first one you get after returning being on a mission that's titled "Graffiti Gratitude", which you get by making him reveal in additional picture he painted on a ship by one of the lighthouses. In addition to the pictures he made about their adventure that was seen in the credits, this confirms that despite acting like he was ungrateful, he was in fact quite grateful to Mario for his help and actually enjoyed their adventure; he probably just didn't know how to express it, felt pressured to act hostile to him again once they were finished helping his dad, and was better at expressing his true feelings through painting rather than through words. Upon 100% completion, Bowser Jr. turns into a cat-like form similar to Meowser, although this is purely cosmetic.
Whenever Mario takes damage while Bowser Jr. is not doing anything, the latter giggles at him. Should Mario get hit while in small form, however, Bowser Jr. gasps in distress instead.
If the player scans the Bowser Jr. amiibo, Bowser Jr. produces a red shockwave identical to that of POW Blocks that defeats any nearby enemies and destroys most objects.
===Super Mario Bros. Wonder===
Bowser Jr. returns as an antagonist. He now has a unique form, Wonder Bowser Jr.. Bowser Jr. is fought four times, appearing at the end of the palaces in Pipe-Rock Plateau, Fluff-Puff Peaks, Sunbaked Desert, and Deep Magma Bog, as well as in the beginning of the final level, The Final Battle! Bowser's Rage Stage. He begins each encounter in his normal form, attacking by spinning back and forth in his shell, and by spitting fireballs. After taking damage once, he will transform into his Wonder Bowser Jr. form, and cause a variety of Wonder Effects that change the fight. Additionally, this game marks the first time since New Super Mario Bros. where Bowser Jr. fights outside of a vehicle or machine.
==In ==
===Mario Kart: Double Dash!!===
Bowser Jr. makes his first Mario Kart appearance in Mario Kart: Double Dash!!, his partner is Bowser, and they have a Special Item of a Bowser Shell, like his father in the game. 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.
====Mario Kart Arcade GP/Mario Kart Arcade GP 2====
Bowser Jr. makes a cameo appearance in the course Bowser's Castle from Mario Kart Arcade GP and Mario Kart Arcade GP 2. He spectates the race from his throne at the hairpin turn in his throne room.
===Mario Kart Wii===
Bowser Jr. is an unlockable playable character in Mario Kart Wii, and to unlock him, a player has to beat all of the retro cups with one or more stars on 100cc on Grand Prix. Junior is a medium character, and he is a Staff Ghost in N64 Bowser's Castle used by Nin★GASK1 on a Standard Kart M and Nin★Kentan on a Sneakster. His status is the worst of the game, containing 1 point off-road and 1 point Mini-Turbo. The colors of their vehicles are yellow and dark green.
===Mario Kart 8 Deluxe===
Bowser Jr. came back to the Mario Kart series. Himself along with King Boo, Dry Bones, Gold Mario, Inkling Boy, and Inkling Girl. Since he appeared only in this game, he is used by the 200cc Staff Ghost, Nin★Giulia on a Koopa Clown with a Cyber Slick and Cloud Glider in Cloudtop Cruise.
===Mario Kart Live: Home Circuit===
Bowser Jr. appears alongside the Koopalings as one of the racing opponents. He is seen using his personalized Koopa Clown from Mario Kart 8 Deluxe. This game marks the first appearance of Bowser Jr. without Bowser.
===Mario Kart Tour===
Bowser Jr. appears in Mario Kart Tour as a Super driver. His special skill is Bowser's Shell. The Pirate Tour introduced a High-End variant of him named Bowser Jr. (Pirate), who has the Bob-omb Cannon as his special skill. Starting from the Sky Tour, Bowser Jr. (Pirate) is available in all regular tour pipes, including the All-Clear Pipe.
The game classifies Bowser Jr. and his variant as baby drivers, as they count in challenges that require performing a certain action during a race using a baby character.
==In ==
===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 unlockable character. He has a straight shot with low trajectory, and is unlocked by completing the 18 Hole Birdie Challenge, which is unlocked after beating the Front and Back 9. It is also the first time he is a playable character, as well as the first time he is depicted as wearing his toothy white bandana. Bowser Jr.'s alter ego Shadow Mario also appears as a separate playable character. 
When Bowser Jr. achieves a par, he giggles, performs some spins, and strikes a pose, and when he achieves a birdie, he jumps up in joy. His eagle or better animation shows him running while spreading his arms like an airplane and mimicking plane sounds; afterwards, he performs a flip and strikes a pose. If he achieves a bogey, he mopes around while whimpering quietly. If he achieves a double bogey or worse, he sobs and then wails loudly.
===Mario Golf: World Tour===
Bowser Jr. returns as a playable character in Mario Golf: World Tour. Like Mario Golf: Toadstool Tour, he has a straight shot with low height. Unlike the previous game, he is a default character, and does not sport his bandana around his mouth. He also shares Sweet Spot and Control stats with Diddy Kong, who oddly now has more power than Jr.. Bowser Jr.'s power has also decreased 8 yards to a total distance of 260 yards. 
When Bowser Jr. gets a par, he does some twirls and strikes a pose, and when he gets a birdie, he flings the Magic Paintbrush in the air in victory. His eagle or better animation shows him doing a flip, painting a rainbow across the screen and then striking a pose. If he gets a bogey, he yells and slashes at the screen with the Magic Paintbrush two times out of frustration, covering the screen with rainbow goop. If he gets a double bogey or worse, he screams even louder and flings the Magic Paintbrush away in an attempt to paint the screen, but stumbles.
===Mario Golf: Super Rush===
Bowser Jr. appears as a Spin character with average stats. He has the Smokeball as his Special Shot and the Bullet Bill Dash as his Special Dash. He also sports a new golfing outfit.
==In ==
===Mario Superstar Baseball===
Bowser Jr. appears as a Power character in Mario Superstar Baseball, with a strong bat that can easily send balls flying and the ability Body Check to muscle his way through anyone in his path, at the expense of his other stats being mediocre. He also has the ability to Wall Jump, which lets him stop balls from flying out of the park with precise timing. He also runs around the map in challenge mode challenging Peach, Mario, Yoshi Wario and Donkey kong to baseball games. However when playing as Bowser he does not run around.
===Mario Super Sluggers===
He is an enemy of story mode and a playable character. Bowser Jr. uses his Magic Paintbrush rather than his spiky baseball bat in Mario Superstar Baseball. He owns his own stadium which is called Bowser Jr.'s Playroom. Mario and his team must confront him, or challenge him to a short game of baseball when he is roaming around the other captains' stadiums. His status is characterized by very fast and strong, but his pitching is very low. Bowser Jr. has his special move makes the opponent's camera is hit by paint and difficult to hit the ball. In his other special is when the batching when Jr. hit the ball, where the ball will land is covered with ink, and if the opponent go over the ink, slips and makes Bowser Jr. can benefit to a Home Run. This special move can be undone by flying characters like King Boo, Boo, Paratroopa and Paragoomba. In the second of the quartet of cinematics, Bowser Jr. witnesses Mario and Luigi on a live-footage screen in his office of the playroom and adjusts the lever to make his venue pop out of the ocean, ramming it to the northern portion of the Baseball Kingdom. Mario and Luigi witness the arrival of Bowser Jr. and his minion emerge from the entrance of the venue. During the last of the four cinematics, Bowser Jr. and his father are seen to be escorted by Daisy to the Daisy Cruiser at night, regardless of Bowser Jr.'s history of previously transforming Daisy into a statue earlier in the story. As the other characters have some desserts, Bowser Jr. and his father are briefly seen at one table, still feeling depressed and distraught after losing the recent showdown.
==In Mario Strikers Charged==
Bowser Jr. is the first champion of the Fire Cup. After beating the cup players will unlock Bowser Jr. as a playable character. He is good at shooting and passing and bad at everything else. His special is Sonic Roar, in which he leans forward and screams, shrinking any characters in range (including his own teammates).
His original teammates is: Dry Bones, Hammer Bro and a Koopa.
==In ==
===Mario Party DS===
Bowser Jr. and his father invited Mario and his friends to a Party at Bowser's Castle in Mario Party DS to apologize for the King's evil actions. This of course was a trap. Bowser shrank the crew down to an incredible small size and had Kamek throw them out. When the crew reached the castle again, Bowser Jr. and Bowser waited to destroy them by throwing them in Bowser's pinball machine, with Bowser Jr. controlling the flippers. In the Rocket Rascals mini-game mode, Bowser Jr. will frequently appear and cause bad luck for the group.
===Mario Party 9===
Bowser Jr. appears in Mario Party 9 causing trouble for the players yet again. He has his own kind of minigames which pit two players against him. His minigames are played when a player lands on a Bowser Jr. Space and if the players manage to beat him, both players receive five Mini Stars each. If Bowser Jr. wins the minigame, he takes five Mini Stars from each player who played the minigame. His personal Junior Clown Car also comes back. He is also the mid-boss of Bowser Station, being fought in Bowser Jr. Breakdown. In Solo Mode, he is shown in the opening helping Bowser steal all the Mini Stars from the sky. In the opening of every board, he frantically tells Bowser about the player's progress and their group's destination. After the player beats Bowser in the final battle, he and Bowser Jr. are shown flying in their respective vehicles. Bowser moans that his dream of having every single Mini Star has failed. Bowser and Bowser Jr. observe the sky around them, now filled with Mini Stars. In a last-minute effort, Bowser tries to snag a couple of the surrounding Mini Stars, only to fall out of his Koopa Clown Car. Bowser Jr. then rushes to save his dad. They are not seen for the rest of the game.
===Mario Party: Island Tour===
For the first time ever in the Mario Party series, Bowser Jr. becomes a playable character in Mario Party: Island Tour. He will most likely be replacing Koopa Kid who has been a playable character in the Mario Party games since Mario Party 5. He can be played by completing Bowser's Tower. If he is chosen for Bowser's Tower, he will receive unique dialogue from his father.
===Mario Party 10===
Bowser Jr. makes a reappearance, although he is not playable. On all the boards in Mario Party mode except Chaos Castle, Bowser Jr. guards both the mini boss tower and the boss castle. Upon reaching them, he taunts the players as they go inside to confront the enemy. Unlike Mario Party 9, Bowser Jr. is not fought as a mini boss. Additionally, the Bowser Jr. Space has been retooled to function as a roulette similar to his father's space.
In Mario Party mode, if Bowser is not freed from his prison (as seen on the GamePad) by the time the "Homestretch" of the board is reached, his son tosses Bob-ombs and create more of his spaces. However, if Bowser is freed, then all of Junior's spaces are replaced and the event does not happen. As Bowser is already active on Chaos Castle, the spaces are never replaced on that board.
In Bowser Party mode, Bowser Jr. functions as a host and helper for the Bowser player and appears when Team Mario land on either his space, or the 'Bowser Dice Block + 1' space. Events exclusive to this mode include giving Bowser extra Dice Blocks, and knocking players back a certain number spaces. Additionally, if Bowser is doing poorly by the time Team Mario reaches the final section of the board, he spins a special roulette to give his father an advantage. Finally, he is always one of three potential options to hold the Super Star during the final challenge. While the other two candidates are eliminated after a wrong choice, Jr. is not.
In amiibo Party, Bowser Jr. appears as a board element of the Bowser board where he jumps on the head of the player who activates him and challenges them to a minigame. If the player wins, he gives them 10 coins. If Bowser Jr. wins, the player loses 10 coins. If one of the players is playing as Bowser, they do not play a minigame but instead spin a roulette to determine how many coins they get.
In Bowser Challenge mode, Bowser Jr. reprises his role as host. After Bowser has completed all ten minigames, he ranks his father's performance. If Bowser reaches a certain rank, Junior upgrades his throne.
Unlike its predecessor, there are only two Bowser Jr. minigames in Mario Party 10, which can only be played in the Bonus Games mode and on the Bowser Board in amiibo Party.
===Mario Party: Star Rush===
Bowser Jr. appears in the mini game “Bowser Jr’s Pound for Pound”, Where Kamek enlarges him and his Koopa Clown Car. The goal in the mini game is to ground pound the blue and orange switches around him. Bowser Jr. can attack the players by swinging the arms of the Koopa Clown Car around, intending to hit the players. After all the switches have been ground pounded, Bowser Jr. shrinks back to normal and flies away.
===Super Mario Party===
Bowser Jr. was a playable character in Super Mario Party making it the second Mario Party installment to feature him as a playable character, and the first on a home console. Bowser Jr. is one of the characters summoned by Bowser to have the opportunity to be crowned "Super Star". Bowser Jr.'s Dice Block is safer and less risky than Bowser's Dice Block, having three 1's, two 4's, and one 9. If Bowser becomes the superstar, Bowser Jr. congratulates him due to Bowser being the one who congratulates the other characters if they win.
==In Mario Sports Mix==
Bowser Jr. is a speed-based playable character. In Bowser Jr's special move, he uses his paintbrush to put slippery graffiti on the playing field which makes the players slip which makes it very hard to block/dodge/receive. He is a playable character from the start. Bowser Jr. has his own stadium named Bowser Jr. Blvd..
==In ==
===Paper Mario: Sticker Star===
Bowser Jr. plays a somewhat major role, being the tertiary antagonist behind Bowser and Kamek. He is first seen in the very first level chasing a Toad who has the rare Scissors sticker and the Toad gives it to Mario. Bowser Jr. can actually smell the Sticker Mario has and challenges him to a fight. Bowser Jr., however, is instantly defeated by Mario who used the very same Sticker on him and flies away. Bowser Jr. is seen again challenging Mario to another fight as he sails back from World 4 to Surfshine Harbor. Bowser Jr. plays a little harder this time keeping Bob-ombs over his head to prevent Mario from Jumping on him. Bowser Jr. is defeated again and flies off promising revenge. Bowser Jr. is seen for the last time in the second to last level preventing Mario from reaching his father with his battleship. Bowser Jr. comes into a battle with a shield which raises his defensive power dramatically. Mario, however, counters this using the Tail sticker and Bowser Jr. is defeated and is never seen again. Bowser Jr. makes a cameo appearance in the parade at the end.
===Paper Mario: The Origami King===
Bowser Jr. has a large role, although he is now an ally of Mario's. In Shangri-Spa, Bowser Jr. attempts to attack the Boss Sumo Bro that is guarding Bowser's castle. He is shredded by a pair of Scissors. This ends with Mario healing Bowser Jr. by bringing him to the spa's five springs. Later, at Hotfoot Crater, Bowser Jr. holds back a horde of Paper Macho Goombas in order to allow Mario to confront King Olly.
==In ==
===Mario & Luigi: Dream Team===
Bowser Jr. only appears as a boss in Mario & Luigi: Dream Team. He is the last boss fought in the Battle Ring.
===Mario & Luigi: Paper Jam===
Bowser Jr. and his paper counterpart appear in Mario & Luigi Paper Jam and serve as the secondary antagonists.
Bowser Jr. first appears alongside his paper counterpart in Bowser's Castle, where they meet each other for the first time. Unlike his father and Kamek, Bowser Jr. and Paper Bowser Jr. quickly resolve their argument and become friends. The two Bowser Jrs. are later tasked to watch the two princesses as the two Bowsers and Kameks line up their troops. As they stand guard to watch the princesses, they both get the idea of destroying the book to prevent Paper Bowser Jr. from going home so that they can both no longer feel bored. In Doop Doop Dunes, as Roy is about to take the book to throw in the trash, Bowser Jr. and his paper counterpart show up and stop him. After a brief discussion with Roy, Bowser Jr. takes the book from the ground and heads back to Bowser's Castle.
Back at Bowser's Castle, the Bowser Jrs. go to throw the book in the trash before changing their minds, instead choosing to keep it. The Bowser Jrs. then attempt to show the book to their fathers, but the Bowsers tell them that they are busy and to keep watching the princesses. The two Bowser Jrs. then start to complain and jump around the room saying they don't want to be on guard duty. Kamek suggests to Bowser to take the Juniors to the Mount Brrr villa, which the Juniors agree to do as they are promised a special surprise. They take the princesses along with them.
At the Mount Brrr villa, as Bowser Jr. is impressed at the area, Paper Bowser Jr. appears and tell him to checkout a papercraft of themselves. Later on, as Mario & co. climb up the mountain, they notice Bowser Jr. at a higher level, who enjoys the high area before making himself leave from Paper Bowser Jr. playing with their new Papercraft. When the Mario gang reach the top of Mount Brrr, they encounter the two Bowser Jr.s with their new papercraft. The Kameks advice the Juniors to leave the area but the Juniors want to stay and play with their new papercraft. After Toadette sends the newly built Papercraft Peach to the Mario gang, they battle the Bowser Jrs. in a papercraft battle. After Mario & co. destroy the Papercraft Bowser Jr., the Juniors along with the Kamek duo retreat to Bowser's Castle, but they drop a red medallion along the way. The two are later seen guarding the Princesses again. While the regular Bowser Jr. sleeps, the two Peachs are successfully able to trick Paper Bowser Jr. with a decoy and escape their cage.
They soon realize they have been tricked and recapture the two Peachs before they can reunite with the Marios. Bowser Jr. and Paper Bowser Jr. deduce the Mario gang is attempting to steal back both the Peachs and the book, and taunt the Mario gang by showing it off, which they admit was not a smart move. They then run off in different directions until the trio sneaks up and captures them both. They give the group a fake book and then retreat back to where they were first encountered. Commenting that fighting is more fun than running anyway, the two engage the Mario gang in battle.
Reflecting their friendship throughout the game, the pair fight as the Mario Bros. would and almost always attack in tandem with each other. When one of their HP is getting low, the other can heal them with a Mushroom. Furthermore, whenever the one of the trio attacks, the can hide inside their Junior Clown Cars, completely protecting themselves from everything except aerial attacks. Their first move involves each of them pointing at a specific Bro, indicating to the player who has been targeted. They then fly back a large distance in their Clown Cars and start to ram at their victims, changing positions to throw off the player (if either one suddenly jumps out of their Car, it drifts towards Paper Mario). Successfully countering the attacks causes the two to fall on the ground in front of the heroes, allowing them to hit the Jrs. with additional hammer strikes before they get back into their Cars. Bowser Jr. then challenges the Marios to a flying contest by folding their paper partners into airplanes. Paper Mario must then race Paper Junior by pressing just as he is about to hit the ground in order to gain more distance and height. If Paper Mario manages to win, spiked iron balls drop from above the screen and smash the Juniors on their heads. Likewise, if Paper Bowser Jr. flies further, the iron balls fall on the Bros., inflicting massive damage. Another attack they have is to order Shy Guys to cover the group in barrels as they run away from the spoiled children. Meanwhile, the Jrs. take turns shooting fireballs at them, who must jump to dodge them (The player can also jump to remember which Bro is which, or look for Paper Mario's feet). Failure to avoid the fireballs results in the hit Bros. falling down, while dodging their onslaught allows the team members that were not hit throwing off their barrels, which hit the pair. Bowser Jr. can sometimes fly into the background and lift a gargantuan cannonball with his insignia, throwing it at the heroes who need to use the Trampoline Guard to send it back at him. Paper Junior can also lie in wait on the floor during the attack, and the trio must sidestep him in order to avoid getting ambushed and extremely hurt by the cannonball. After several successful bounces, the cannonball falls onto Junior, delivering a solid blow. Once a single Junior is taken out, the gang must defeat the other as quickly as possible, or he revive his partner with a 1-Up Mushroom. If they manage to accomplish that, they win the battle.
As the Mario gang celebrate their victory, the two Bowser Jrs. lay heavily injured on the floor. They think back on all of the fun they had together and their dream of staying friends forever, as well as their ill-fated decision not to destroy the book when they had the chance. Before the Mario gang are able to recover the book from them, Bowser and Paper Bowser appear and complain that the princesses have escaped under their sons' watch. When the two realize that their sons can barely move or speak because of their injuries fighting Mario, the Bowsers become enraged and cradle them in their arms. As the Bowsers show off the modifications to their castle, the two Bowser Jrs. feebly try to tell their dads how important it is that Mario does not get the book, but neither listens to them at first.
Neither are seen for the rest of the game, although presumably Paper Bowser Jr. is forced to return to his own world after the trio retrieve the book at the end of the game.
===Mario & Luigi: Superstar Saga + Bowser's Minions===
Bowser Jr. can be recruited after the final boss. He is a Flying-type trooper, and was the only obtainable trooper with the Special Skill Smack Back Attack.
===Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey===
Bowser Jr. is the main protagonist of Bowser Jr.'s Journey. This is the first game where Bowser Jr. appears as a playable protagonist. He is the permanent captain of the player's squad and can change freely between the three trooper types: in Melee form he wields a Hammer Bro's hammer, in Flying form he drives his Clown Car, and in Ranged form he wears his bandana and wields his paintbrush.
==Crossover appearances==
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====Super Smash Bros. Brawl====
Bowser Jr. appear as a sticker and as a trophy.
====Super Smash Bros. for Nintendo 3DS/Super Smash Bros. for Wii U====
This is Bowser Jr.'s first playable appearance in the Super Smash Bros. series. He fights inside his Junior Clown Car, from which he uses a variety of weapons to attack. Bowser Jr.'s palette swaps are the Koopalings, by extension also making all seven of them playable characters.
====Super Smash Bros. Ultimate====
Bowser Jr. is an unlockable playable character The Koopalings reappear as Bowser Jr.'s seven alternate costumes, and each of them now use their Magic Wands from Super Mario Bros. 3 instead of hammers. Shadow Mario Paint returns as Bowser Jr.'s Final Smash, but it is active for a shorter amount of time. Bowser Jr.'s standard attack now ends with an uppercut, while several of his attacks have decreased range; his down throw is also much stronger. Bowser Jr.'s down tilt now allows him to consume food. His forward smash is called Smash Twin Drills. Although his up tilt has a sourspot that deals less damage, Bowser Jr.'s down tilt, dash attack, and standard aerial all deal more damage.
Bowser Jr. benefits from universal changes, such as: increased mobility, the reduced short hop timing, lessened landing lag in his aerial attacks, the reintroduction of directional air dodges, and the abilities to use any ground attack out of a run, as well as using aerial attacks on ladders. The Junior Clown Car's hurtbox now takes priority over his own hurtbox, making it harder for opponents to deal additional damage to him. Bowser Jr.'s special attacks also receive a mixture of buffs and nerfs to rebalance them.
Bowser Jr., alongside King K. Rool and Villager, make a cameo toward the end of Ken Masters's and Incineroar's debut trailer, "Clash of Flames," where they await to challenge Incineroar after it defeated Ken, much to its chagrin. Bowser Jr. also makes a small appearance within Sephiroth's reveal trailer.
Category:Character appearances