Monkey D. Luffy, captain of the Straw Hat Pirates, has been sailing the seas for over 1,000 chapters. He's now closer than ever to achieving his dream of finding the titular One Piece, not to mention becoming the Pirate King. Although Luffy set out on his own, he gradually gathered a talented crew now renowned across the world of One Piece. The story behind each Straw Hat joining the crew is impactful enough on its own. Because Luffy gained their respect, they wholeheartedly believe he will become the Pirate King.
Source：https://www.cbr.com/one-piece-straw-hats-say-luffy-will-be-pirate-king/
