“We’re not going to change Mickey’s image so much. People don’t like it when you mess with Mickey. We did a focus test that was really eye-opening for me. There was a biker dude saying, ‘Oh, I’d never play a Mickey Mouse game,’ and then we showed him images of a changed Mickey. I was sitting there thinking, ‘You’re gonna love what we do,’ but he said, ‘No! Don’t mess with my childhood.’” - Warren Spector
Mickey was originally supposed to take on a visual appearance closer to a rat if you were causing all kinds of trouble in the game. Since that idea tested poorly, Mickey’s visuals will not take on a smudgy appearance if you’re doing evil deeds.