Cuphead is the titular protagonist of the same name. Cuphead is Mugman's irresponsible older twin brother and like the rest of his family, lives on Inkwell Isle. He is usually played by the first player and as a result, was the default character for Player One before the update in April 2019, after which the first player can choose whether to play as him or Mugman C'mon, Mug! We have to find the Elder Kettle! He'll know what to do!"
—Cuphead to Mugman, Introduction