Cuphead (カップヘッド, Cuphead) is the eponymous main character of the indie-developed run-and-gun platformer, Cuphead. He is an anthropomorphic teacup whose design pays homage to vintage cartoon characters like Felix the Cat and Mickey Mouse.
Cuphead lives in the Inkwell Isles with his brother, Mugman, and his caretaker, the Elder Kettle. Despite the Elder Kettle's warnings, the brothers wandered far away from their home and found themselves at the Devil's Casino. Their winning streak impressed the casino's owner, the Devil, who tempted them by betting all of the casino's riches, promising to take away the brothers' souls should they lose. Blinded by greed and ignorant of his brother's warning, Cuphead rolled the dice, but ultimately lost the gamble. With the brothers pleading for their lives spared, the Devil cut a deal with them, letting them live should they retrieve the soul contracts of the debtors who previously gambled with him. After receiving a potion from the Elder Kettle that allowed them to fire bullets through finger snaps, the brothers set off to collect the soul contracts, encountering the Devil's cronies along the way. After Cuphead and Mugman returned all of the contracts, the Devil offers them the choice of handing the contracts to him and have them join his team. After refusing, they defeat the Devil and burn the soul contracts, releasing the debtors from his grasp.
As a costume
Cuphead appears as a downloadable Mii Gunner costume as part of Round 5 for Ultimate. He is the second indie character to appear as a Mii costume, following Sans. Upon downloading the costume, the song Floral Fury is unlocked as an additional music track in the "Other" category. Like Sans, Cuphead appears as a fully modeled character; his "mask" is just his head, instead of a mask with the Mii's face visible like other character-based costumes. Much like in his game, his "gun" is simply his hand in reference to the myriad of attacks that Cuphead performs by making a gun formation with his fingers.
Cuphead's reveal trailer makes many references to his game. It opens with an imitation of the storybook-style opening of Cuphead, with the screenshot closely matching to its first "page". Said screenshot features a Villager using a bug net (resembling Mugman) and uses the phrase "a good day for a swell battle", something that's said before boss fights. Mushroomy Kingdom is used in the trailer, referencing the sepia colour palette and grained filter of Cuphead. The Cuphead Mii Gunner uses moves that are similar to weapons from the game: Bomb Drop mirrors the Lobber, and forward smash and forward aerial both mirror the Peashooter. In addition, the way the screen scrolls, the Gunner's usage of projectiles, and the usage of Stamina mode all reference the "Run-and-Gun" minigames that appear in the game. The characters fought in his reveal trailer are references to various bosses from his game: Piranha Plant represents Cagney Carnation (whose theme song, "Floral Fury", is the track included with the costume); blue Kirby represents Goopy Le Grande; green Charizard represents Grim Matchstick; and Falco represents Wally Warbles. His reveal ends on New Pork City, which resembles the Devil's Casino due to its flashing neon signs and searchlights; the stage is also used for his spirit battle.