Haki is one of the most important powers to exist in the One Piece world. This ability is present within everyone; however, there is a facet of this power that only a select few can utilize, called Conqueror's Haki. While Haki is not the primary power system in One Piece, it is absolutely essential if a pirate intends to conquer the latter half of the Grand Line, the New World.

The legendary pirates of the One Piece world have all held this skill and trained it to the highest level, which is how they made a name for themselves that has reverberated throughout history. The legendary pirates of One Piece have trained their Haki to the very best level, but not all of them have the same level of mastery over this skill.

Shiki, the Flying Pirate, is a legend who was once a rival to the likes of the Pirate King, Gol D. Roger. He was extremely powerful; however, he primarily relied on his Devil Fruit, the Paramecia-type Fuwa Fuwa no Mi. Fans have never seen him utilize Haki.

However, it can be assumed that he did have access to this skill. How far he had trained the skill and how strong it was remains unknown and, unfortunately, it is highly likely that fans will never find out.

Big Mom was one of the Emperors of the Sea until recently. However, now, her status remains unknown. Regardless, in her days as one of the Yonko, Big Mom was absolutely menacing.

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