Professor Rupert Marmalade IV is the main antagonist of The Bad Guys book series and the 2022 DreamWorks animated film adaptation of the same name.
He is an anthropomorphic guinea pig who is known for being a philanthropist and might seem like a good person, but in reality, he's a cruel, self-centered fraud who wants to destroy the world and steal anything by using others. He is also the former mentor of both Mr. Wolf and Mr. Snake.