Mr. Piranha is a Bolivian red-bellied piranha who is the "muscle" of the gang and one of the three tritagonists (alongside Ms. Tarantula and Mr. Shark) in the book series The Bad Guys and the 2022 DreamWorks animated film adaptation of the same name. Mr. Piranha is a green anthropomorphic piranha fish with orange details. His head resembles a pear and his fin forms a kind of mohawk in the group of criminals, Mr. Piranha is the sneaky type, since he does sneak attack and can also fit through pipes.