Although Devil Fruits and Haki are the main power systems of the series, there are some powerful characters who don't even use them.

Zoro's King of Hell makes him one of the strongest One Piece characters.

Luffy can still enhance his Haki in One Piece and Scopper Gaban will show him the way.

This article contains spoilers from One Piece's Final Saga. One Piece is currently in its final saga, and it is here that Oda is revealing some of the most powerful characters whom the fans have ...