Monster Vinnie is a tall wooden marionette. He has a matching black velvet shirt and pants. He wears a black-and-white striped undershirt and underpants. The shirt has 3 white buttons. His face is white and two blue lines run from his eyes down to his mouth. His cheeks are also blue. His mouth and fingertips are stained with what appears to be blue blood.
Monster Vinnie's behaviour is similar to Monster Rat's but more aggressive and twichy.