Who can defeat Luffy?

Who can defeat Luffy? Finally, there even exists a character within the One Piece world who could easily defeat protagonist Monkey D. Luffy. Gol D. Roger is widely agreed upon as the strongest character to ever live in the series thus far, being the only one to attain the title of Pirate King.

Finally, there even exists a character within the One Piece world who could easily defeat protagonist Monkey D. Luffy. Gol D. Roger is widely agreed upon as the strongest character to ever live in the series thus far, being the only one to attain the title of Pirate King.