As the series started to explore the concept of Haki and all the possibilities surrounding it, fans soon started to speculate ...

In the current era of One Piece, three characters have been confirmed to be the greatest Haki masters.

The advanced form of Conqueror's Haki is even rarer than the basic one, as only a handful of people have demonstrated its usage. These people are considered to be at the pinnacle of power itself.

The Holy Knights of God are fearsome fighters. Many of them have powerful Haki.