User Summary One Piece is an anime about Monkey D. Luffy, a young boy who aspires to be the greatest pirate the world has ever seen. Along with his pirate crew, a swordsman named Zoro, a thief named Nami, a liar named Usopp, and a cook named Sanji, they travel the seas searching for the treasure called the One Piece. You play the characters as they go through their various adventures. Bosses are the major villains of the series, such as Buggy the Clown, Alvida, Eric, Mr. 5, Miss Valentine, and so on.