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Nabbit is a recurring character that first appeared as an enemy in New Super Mario Bros. U and a playable character in New Super Luigi U. The name Nabbit being a play on the words nab and rabbit, Nabbit is a thief who steals items, particularly from Toad Houses, and runs away with them in his bag. He is a purple rabbit with round eyes, long ears, and black limbs. He also wears a white handkerchief with a drawing of a large mouth with sharpened teeth, similar to Bowser Jr.'s mask, as well as orange shoes and white gloves.
Super Mario series
New Super Mario Bros. U
In New Super Mario Bros. U, Nabbit appears throughout several levels. When encountered by Mario and friends, they must chase him throughout the course within 100 seconds. The heroes can also toss Koopa Shells at Nabbit, slide into him, or throw iceballs or fireballs to stun him for a couple of seconds. Tapping him on the GamePad using Boost Mode will slow him down, making it easier to catch him (multiplayer only). When Nabbit is eventually caught, Toad will give a P-Acorn as a reward in exchange for the bag. If players fail to catch him three times, Nabbit will flee and disappear until conditions are met. Catching him over a bottomless pit also causes him to escape. As a side note, the bag has never actually been opened, except in Super Smash Bros. for Wii U.
Nabbit appears in every world, except Peach's Castle and Superstar Road, and catching him in each of these worlds will congratulate the player. Once he is caught in the necessary worlds, he will still appear in the same levels as before after playing three levels.
The player can first find Nabbit in seven levels:
He also appears if the player takes too long to open the chest after defeating the enemies in an enemy course, in which case he will steal the item from the chest. To do this, it takes 30 to 45 seconds.
New Super Luigi U
Nabbit reappears in New Super Luigi U, this time as a new playable character (replacing Mario from the original game). Unlike other playable characters, Nabbit cannot use power-ups (except for Super Stars), hold anything, or ride Yoshis, but he is immune to all enemy attacks, though he can still get knocked back by tougher enemies, such as Grrrols. Also, despite his immunity to enemy attacks, Nabbit can still lose lives by falling into lava, poison water, bottomless pits, getting crushed by certain obstacles, getting eaten by a Cheep Chomp, exposure to volcanic ash, or running out of time.
The power-ups he collects are released as 1-Up Mushrooms at the end of the level. In single player mode, Luigi must chase him like in the original, in the same levels as in New Super Mario Bros. U. Nabbit can also be playable anytime in single player mode by holding on the Gamepad or the Pro Controller or holding the on the Wii Remote while entering any level, except the Flying Squirrel Ovation level in Superstar Road world where a Mii can be played as instead of Nabbit.
Once again, Nabbit still comes and steals the item from a chest if the player waits too long to collect a chest despite being on Luigi's side. If the player is playing as Nabbit, the screen fades after taking too long.
New Super Mario Bros. U Deluxe
Nabbit will reappear as a playable character in New Super Mario Bros. U Deluxe, retaining his invincibility, scuttle jump and low traction from New Super Luigi U. Nabbit may now also be playable in New Super Mario Bros. U levels. 
Super Mario Maker
Beginning with the version 1.40 update of Super Mario Maker, a Nabbit costume is available. The player can unlock it by beating the 100 Mario Challenge on Normal or a more difficult mode after a certain number of attempts. Once unlocked, it can be accessed in-game through the use of a Mystery Mushroom, even though only the Super Mario Bros. style permits the use of the costume.
Nabbit's power-up jingle, death jingle, and victory jingle are all taken from New Super Mario Bros. U; however, the jump sound is distinctive for the character, as a short squeaky noise can be heard while he jumps. Furthermore, the player can press the button on the GamePad to make Nabbit face the camera and release a jolly laugh.
Mario Golf: World Tour
Nabbit appears for the first time in the Mario Golf series, as well as his first spin-off and handheld appearance, in Mario Golf: World Tour as a DLC-exclusive bonus character. He is obtained by purchasing the Flower Pack, either individually or via the Season Pass. His normal driving distance is 213 yards, while his star driving distance is 274 yards. His shot trajectory has a huge draw that travels at the lowest height out of all characters, making his shots harder to fly over obstacles. However, they are the least affected by wind out of all characters. His celebrations involve swinging his bag when gets a Par, running around the place waving when he gets a Birdie, or going onto a New Super Mario Bros U level and flying in the air if he gets better than Birdie. If he gets a Bogey he will hide in his bag, and if he gets worse than Bogey, he gets eaten by a Piranha Plant upon hiding in his bag. The player can also win a Nabbit costume by completing a costume challenge at Bowser's Castle.
Super Smash Bros. series
Super Smash Bros. for Wii U
Nabbit makes an appearance in Super Smash Bros. for Wii U in the Mushroom Kingdom U stage. After Kamek changes the stage's layout, he may appear and attempts to catch fighters in his bag. If he does so, he blasts off and takes the fighter with him, knocking them out in the process (unless they get out in time before he crosses the blast zone by button-mashing). Nabbit can also be attacked, grabbed, and is affected by items like a regular fighter. He has knockback akin to playable fighters, and even has the same blast animation when crossing any blast zone (it is colored white, like CPUs). His fall speed is very fast, and can even jump in mid-air like most fighters for recovery.
Nabbit also appears as a random event in Smash Tour, moving along the map and picking up any item he comes across. A player that manages to bump into him can retrieve the items he took.
Super Smash Bros. Ultimate
Mario Party series
Mario Party 10
Super Mario Party
Mario & Luigi: Paper Jam
Nabbit makes an appearance in Mario & Luigi: Paper Jam. His role in the game is to provide new Bros. Attacks throughout the game if Mario and Luigi successfully capture him, effectively replacing Attack Pieces from the previous two games. At the start of the game, the trio will see Nabbit running off from Toads with several items in his sack, while dropping a Red Shell and a Fire Flower before escaping. Most of the Bros. Attacks come from catching him, except Mario's final Bros. Attack, Toad Trail, which he receives after King Bob-omb is defeated. It is possible to skip the first two battles against Nabbit by chasing him around until he engages in battle with an enemy.
As part of retrieving Luigi's final Bros. Attack, Mega Thwonk, the trio must chase Nabbit and fight six battles. Three of these battles are against Nabbit, while another three are alongside him against Bowser's troops.
During the credits, Nabbit is seen three times. First, he is seen in Doop Doop Dunes running past the parade. He stops, takes a look at the landscape, notices the Papercrafts, and dashes away. Later, he is seen in Twinsy Tropics running away from a Yoshi with a Melon. Finally, he is seen on Mount Brrr with six Yoshis chasing him. He trips and drops the Melon, then quickly runs away while the Yoshis celebrate.
Mario & Sonic at the Rio 2016 Olympic Games
Nabbit appears as a new playable character in Mario & Sonic at the Rio 2016 Olympic Games. He is only playable in 100m Dash. During his special action he speeds up and leaves a cloud of dust behind him. This game also marks Nabbit's first game with dialogue.
For his victory animation, Nabbit will laugh before doing a back flip, attempting a midair split, and finishing off with a sideways flip that nearly sends him falling off the podium. For his second or third place animation, he will start running in place before doing a back flip and a twirl. For his losing animation, Nabbit will prepare to take off before he suddenly stops and lets his ears droop down.
Other appearances, cameos, and references
The character Ravio from The Legend of Zelda: A Link Between Worlds has a similar appearance to Nabbit, as pointed out by several fans in the comments of a Miiverse post with an in-development screenshot showing the character. However, Satoru Iwata, during the October 1, 2013 Nintendo Direct, officially dismissed the similarities as an unintentional coincidence. Additionally, Iwata added that because the developers work so closely together that it is not surprising that similar designs could manifest in different, unrelated games.
Nabbit is referenced in Star Fox Guard by a robot in the Chaos Class known as Nabbot that boasts similar characteristics. Its description mentions that it "races around stealing precious metals and then runs away."
Official profiles and statistics
Flag description (Wii U version)
Miis' Dialogues (Wii U version)
Names in other languages