One Piece Manga Has revealed a taste of Shanks True Conqueror’s Haki power. With a level of Haki we have never seen before, Shanks might just be the strongest haki user in the entire world of One Piece. However, considering some of the Big Legends like Gol D. Roger, Whitebeard and even Rocks D. Xebec, How powerful can an individual haki get? And how many users exist that can use such power. We go over every conqueror’s haki user in the entire series so that YOU, the community, can decide as to who is the strongest haki user. As well as who out of the entire list of One Piece Characters can use all 3 types of hakis, Observation’s, armament, and conquerors at even their advance states. Which puts them at a level of their own to pirate king level!