Seiryu could transform Zoro's strength, swordsmanship, and battle dynamics, making him unstoppable in One Piece.

Roronoa Zoro, Luffy’s de facto first mate in One Piece, is known for his ambition to defeat Dracule Mihawk and become the greatest swordsman in the entire world. I also know him as one of the only ...

Roronoa Zoro as seen in the anime (Image via Toei Animation) Just like Gaban, Sanji might also be Luffy's 'left-hand man. ' While this rank has no definition, it stands below the right-hand man.