Conqueror's Haki is one of the rarest powers to exist in the One Piece world. Unlike the other two Haki forms, this power isn't accessible by everyone but exists within only a chosen few. Its basic level allows the user to intimidate and overwhelm those who have weaker wills.
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The advanced usage of this technique allows the user to coat themselves with Conqueror's Haki and deal significantly greater damage to their enemies. Although Conqueror's Haki is rare, many users exist in the New World and only a handful have total mastery over it.
Boa Hancock Possesses All The Three Types Of Haki
Amazon Lily's Empress, Boa Hancock, is one of the former Shichibukai and an incredibly powerful pirate. She set out to sea as the captain of the Kuja Pirates at a very young age and was immediately made a Shichibukai after her very first voyage placed an 80 million berries bounty on her head.
Hancock is extremely skilled with Haki usage, as explained by the Boa sisters during the Amazon Lily arc. Given that Hancock's sisters could use high-level Haki forms, it is possible that she can tap into advanced Conqueror's Haki as well.
Sengoku Is The Only Marine With Conqueror's Haki So Far
Also known as the Buddha, Sengoku is an extremely powerful Marine who led the organization as its Fleet Admiral before the two-year timeskip. Surprisingly, he's the only known Marine in the story to possess Conqueror's Haki so far.
Sadly, Sengoku hasn't ever utilized this ability to the fans' knowledge, however, the fact that he possesses it was confirmed in the Vivre Card, nonetheless. How proficient he is with this power remains to be seen.
Silvers Rayleigh Could Use Conqueror's Haki Very Well
Introduced during Sabaody Archipelago, Silvers Rayleigh is the Roger Pirates' former First Mate. He's an incredibly powerful pirate who, although doesn't have a Devil Fruit, has great mastery over all the Haki types.
Rayleigh's proficiency with this skill is such that he taught its usage to Monkey D. Luffy. Although he hasn't been seen using its advanced form yet, it is possible that he possesses it. Regardless, his control over the other aspects of Conqueror's Haki is certainly incredible.
Kozuki Oden Could Use It To Quite An Advanced Degree
Oden was one of the strongest samurai to ever live in the Wano Country. He was born as an exceptionally powerful person and during his adventures with Roger and Whitebeard, he grew stronger than ever.
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Oden could use all the Haki types but his specialty appears to have been Ryou. Using his full power, Oden could injure Kaido and give him a massive scar. Unfortunately, it is unknown whether his Togen Totsuka was a Conqueror's Haki attack or if it just saw him use advanced Ryou.
Monkey D. Luffy Has Learned Everything About Conqueror's Haki
Luffy was born with Conqueror's Haki, as confirmed by Oda on several instances in the story. In Wano Country, he managed to pick up how to coat his body with the power, making him much stronger now.
Luffy can use all the forms of basic Conqueror's Haki with great control and although his advanced Conqueror's Haki usage is a bit crude right now, he's sure to improve it in the future. During his fight against Kaido, he was able to hurt the Yonko and drop him to his knees with just a few punches.
Shanks Is An Exceptional Conqueror's Haki User
Shanks is one of the Yonko in the One Piece world and as expected of him, he has great command over Haki. Although Shanks doesn't have a Devil Fruit, he has a mastery over all the three Haki types.
His skill over Conqueror's Haki was displayed to the fans when he visited the Moby Dick and caused physical damage to the ship even when suppressing his Haki. While he hasn't been seen using advanced Conqueror's Haki yet, he most certainly has it under his belt.
Big Mom Used Conqueror's Haki To Knock Page One Out
Like Shanks, Big Mom is a Yonko and thus an incredibly powerful fighter. She has a bounty of 4,338,000,000 berries on her head, which is second only to Yonko Kaido.
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Big Mom has a powerful Devil Fruit called the Soru Soru no Mi in her possession and at the same time, she has a great mastery over all the Haki forms. She was seen using advanced Conqueror's Haki and knock Page One out in a single punch with ease on Onigashima.
Kaido's Strongest Attacks Make Use Of Conqueror's Haki
Yonko Kaido is the strongest pirate alive in the One Piece world at the moment. He possesses the power of the Mythical Zoan Uo Uo no Mi, Model: Seiryu, which makes him a menace in combat. On top of that, Kaido's Conqueror's Haki mastery appears to be immense.
All his strongest techniques, such as Thunder Bagua or Ragnaraku see the usage of this power. In fact, Luffy picked up on how to coat himself in Conqueror's Haki by observing Kaido's techniques.
Whitebeard's Conqueror's Haki Could Rival Gol D. Roger's
Whitebeard was once the strongest known pirate in the world and held an ability that could destroy the entire world. He was Gol D. Roger's rival and the only known man to tie a fight with him, as seen during Oden's flashback.
Whitebeard possessed every Haki type and used them with great proficiency. When the two clashed on a remote island in the Grand Line, Whitebeard used Conqueror's Haki to coat Murakumogiri and matched Roger in battle.
Gol D. Roger Used Advanced Conqueror's Haki As His Main Weapon
The Pirate King, Gol D. Roger had tremendous skill when it came to using Conqueror's Haki. Just like Rayleigh, Roger didn't have a Devil Fruit power, meaning he used Haki as his main tool in battle. Roger wielded the Saijō Ō Wazamono sword, Ace, in combat. During his clash with Whitebeard, he coated Ace in Conqueror's Haki and matched Whitebeard's attack with ease. Given that his ambition was much greater than Whitebeard's, his Conqueror's Haki was likely stronger as well.