Cat-Man is the alter ego of Gumball Watterson, first featured in How to Act Natural Without Really Trying. He is a parody of a famous comic superhero named Batman. He has two sidekics, Fish-Paste, Darwin's alter ego, and Rainbow Girl, Mabel's alter ego. His only weakness is water, and the only villian that is difficult for him to defeat is the Flying Taco.
Cat-Man is the same kind of guy as Gumball. He is not very smart, and never learns from mistakes.