Mr. Wolf is the main protagonist of The Bad Guys book series and the DreamWorks animated movie of the same name.
He is an anthropomorphic wolf who worked as a former thief and criminal who, throughout the story, attempts to reform into a good guy and convince his gang/friends, the Bad Guys, to join in on his redemption, although their old, villainous habits prove to be hard to overcome.
In the movie, he is voiced by Academy Award-winner Sam Rockwell.