One Piece is home to one of the anime industry's greatest rogues galleries. With legendary bad guys such as Kaido and Crocodile, for example, this franchise has made a name for itself with legendary villains who serve as the exact antithesis to everything that the heroes stand for, wreaking havoc in their wake. Many of these villains don't just stand out due to their evil nature, but also their backstories that led them to this life.