Willy is a black and white incarnation of Mickey Mouse and looks similar to the Mickey in the cartoon, Steamboat Willie. He also appears similar to Suicide Mouse, however, his pants are different and his belly appears to be larger.
Willy is hostile. He can move throughout most of the locations. If he is found in the office, the player must shut down a camera.
When moving, he will occasionally talk, saying phrases including:
"Hey." (in a deep voice, only heard on the title screen)
"Hey." (in more of a Mickey-like voice)
"Where's my hat?"
"He isn't nice."
"My boat? You took it!"
Unlike Oswald, Willy does not normally have an echo when talking, with the exception of when he says "hey" and when he talks about his boat.