Black Pete is one of the earlier and forgotten versions of Pete. Black Pete proceeded Putrid Pete who appeared in Oswald the Lucky Rabbit cartoons and has, by this time, shed his bear-like appearance, and had become more defined as a cat.
Black Pete appeared in only a few cartoons, such as The Gallopin' Gaucho and Steamboat Willie.
In Epic Mickey
Black Pete appears residing in Wasteland and is seen in one of its Projector Screens based off Steamboat Willie that links to certain areas in the Gremlin Village. He serves as backround in the first stage. He has a larger role in the third and final part in which he stomps his foot and causes potatoes that can roll down the stairs and hurt Mickey. His steamboat itself appears in the main area of the village as Small Pete's boat.
It is possible that Black Pete is one of the Lost Characters inside the Blot's body. When Mickey defeats all of the Bloticles, it is possible towards the end of the game, Black Pete is revived/restored to his toon form.