Monkey D. Luffy is the protagonist of One Piece and, as fans know already, the man who aims to be the Pirate King. Luffy has already made great progress on the journey to becoming the Pirate King, having recently become a Yonko of the Sea as well. Currently, Luffy is among the strongest characters in the entire world, having acquired a bounty of 3 billion berries after defeating Kaido as well.