Main character who aspires to be a pirate king, amazing contortionist. But that act as the enemy of the outline is the navy ( marine ). Which plays into the 'bad guys ' in this series range from the other pirates to members of government ( World governtment ). The main character in this series focused on Monkey D. Luffy who went looking for a legendary treasure called One Piece. One Piece is an anime and manga series about a group of pirates led by Monkey D.