Nabbit is an enemy introduced in New Super Mario Bros. U and a playable character in New Super Luigi U. The name "Nabbit" is a play on the words "nab" and "rabbit". Nabbit is a thief who steals items from Toad Houses and runs away with them in his bag. His appearance is that of a purple creature 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.
 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 or slide into him to stun him temporarily; or throw fireballs to stop him. When Nabbit is caught, Toad will take the P-Acorn out of the bag and give it to the player as a reward. If players fail to catch him three times, Nabbit will flee and disappear until conditions are met.
Nabbit appears in every world, besides Peach's Castle and Superstar Road, and catching him in every world is necessary in collecting a star on the player's save file. 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:
 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 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, an abyss, or simply getting crushed by certain obstacles.
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. 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 Mii can be played as instead of Nabbit.
Also, 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.
 Names in other languages