Mike is an anthropomorphic white mouse. He wears a red suit and a white shirt under it with red pants and a red fedora, along with a black tie and shoes. He has large white ears that are pink on the inside, and long whiskers. His pink tail is long and thin.
While rehearsing to sing "Let's Face the Music and Dance" and during his final performance of "My Way", he wore a purple version of his suit.
In Christmas-themed TV spots, Mike wore a green version of his suit with red lapels and a red tie, along with a Santa hat.
