In One Piece, Haki is utilized by the strongest characters in the latter part of the Grand Line, yet almost all possess the power of the Conqueror’s Haki. Only a few characters do not wield this power, while simultaneously being masters of Haki.
8. Roronoa Zoro

Zoro is the swordsman of the Straw Hat Pirates, utilizing a three-sword style, and has earned the title of the world’s strongest swordsman. He is incredibly powerful and is capable of using all three types of Haki. Zoro is particularly skilled in using Observation Haki.
Furthermore, Zoro can also master Advanced Conqueror’s Haki, although he can only use it for a short time. If Zoro were to wield it for longer, he risks losing consciousness. However, only a select few can master such powerful abilities.
7. Ben Beckman

Ben Beckman is the right-hand man of Shanks and is undoubtedly a formidable individual regarding strength. It is known that Beckman possesses exceptional Haki mastery. We can confirm that he can utilize both Advanced Conqueror’s Haki and Observation Haki.
In the fourth volume of One Piece, it is hinted that Beckman possesses Haki that surpasses even that of Monkey D. Luffy. This implies that Beckman has the capability to intimidate an entire crew. Based on the facts, it is clear that Ben Beckman is one of the strongest Haki users known in One Piece.
6. Dracule Mihawk

The world’s strongest swordsman, Dracule Mihawk, possesses at least two types of Haki. One Piece has shown that he has the capability to master formidable Haki. The fact that Mihawk wields a black sword indicates that he also possesses exceptional mastery over Conqueror’s Haki.
5. Silvers Rayleigh

Rayleigh was the right-hand man of the Pirate King during his active days as a member of the Roger Pirates. He is one of the most notorious pirates to ever sail the seas, known as the Dark King.
Rayleigh does not wield any form of Conqueror’s Haki, but he is a master of all three types of Haki, with his proficiency in Advanced Conqueror’s Haki being exceptionally high. The comparison of Rayleigh to Monkey D. Garp in terms of strength further highlights his capabilities.
4. Kozuki Oden

When it comes to the use of Haki, few can compare to Kozuki Oden, as he was powerful enough to stand toe-to-toe and clash with Kaido. Oden could utilize both Advanced Conqueror’s Haki and Observation Haki.
Oden was able to injure Kaido with his Conqueror’s Haki, showcasing his immense strength. Had Oden not been distracted, he could have potentially defeated Kaido.
3. Monkey D. Garp

When discussing Haki, few are as renowned as Garp. The Vice Admiral is a legendary figure who has withstood the test of time, but looking back at his past, Garp was a formidable opponent to Roger. These two individuals have clashed many times, proving their exceptional prowess in using Haki.
Garp is proficient in all three types of Haki, with his Observation and Conqueror’s Haki being exceptionally developed. At his peak, Garp’s Conqueror’s Haki was so potent that it could send opponents flying.
2. Shanks

Red-Haired Shanks is known to be one of the strongest users of Haki that fans have seen throughout One Piece. Currently, he is at the peak of his power, meaning his Haki abilities are also at their highest.
With just a single glance, he can intimidate even the most notorious pirates like Kid, showcasing the incredible might of Shanks and his untapped potential.
1. Gol D. Roger

The Pirate King, Gol D. Roger, is recognized as the greatest user of Haki, while Shanks stands as his only equal in this regard.
Although Roger’s true strength has yet to be fully revealed in One Piece, it is understood that he conquered the world solely through his Haki abilities. Even Shanks regards him as a formidable individual who masterfully wielded Haki.