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Maybe with Mugman. The Cuphead Mii costume in Ultimate. He is the second indie character to appear as a Mii costume, following Sans. Cuphead spins and becomes his EX move from plane form, the giant bomb. Alongside Fire Emblem's Byleth, a new wave of Mii Fighter costumes is coming to Smash Ultimate on January 28, including one based on Cuphead. For Super Smash Bros. Ultimate on the Nintendo Switch, a GameFAQs message board topic titled "What if Cuphead got into Smash? How would his moveset work?
Upon downloading the costume, the song Floral Fury is unlocked as … Cuphead appears as a downloadable Mii Gunner costume as part of Round 5 for Ultimate. If he's hit by a projectile or attack, he'll explode, damaging himself and anyone in the vicinity. However, if he runs into something of his own accord, it won't damage him, but it will be a smaller explosion. Ultimate on the Nintendo Switch, a GameFAQs message board topic titled "What if Cuphead was the fighter and Byleth was the costume?