Haki is an incredible power that is present within everyone in the world of One Piece. It is a spiritual energy that, despite being present in everyone, can be awakened by only a select few. In its basic form, Haki has two types, but in one in a million people, a third type, called Conqueror's Haki, can also be awakened.
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Even among those who possess all three types of Haki, only the usage of basic types is common. However, there exist people who can not only use advanced types of Haki, but also very rare types as well. Only the elites of the One Piece world can use rare Haki types, and they can do things like cancel out the Haki of others, and even counter immortality, among others.
Monkey D. Luffy
- Rare Haki Type: Voice of All Things, Immortality Counter
The Captain of the Straw Hat Pirates, Monkey D. Luffy, is a very adept user of Haki. While he can certainly improve in all spheres of Haki, Luffy already has access to some advanced forms. Besides the advanced forms, Luffy can also use some extremely rare Haki types, such as Voice of All Things, which is directly tied to Observation Haki.
On top of that, Luffy will most certainly go on to counter immortality with Haki as well, as he stated to Scopper Gaban. He's not at his peak yet, and he's certainly going to improve his Haki usage in the Final Saga of One Piece.
Scopper Gaban
- Rare Haki Type: Immortality Counter
The left arm of the Pirate King, Scopper Gaban is an incredibly powerful individual with tremendous strength up his sleeve. Fans know him to be a master of Haki. Gaban can use advanced forms of all Haki, but as far as the rare types go, he can use Conqueror's Haki to counter immortality effectively.
It must be noted that Gaban's full strength in combat has not been seen yet, which means that he could also possess other rare forms of Haki that fans do not know about. Either way, Gaban is one of the most powerful Haki users fans have seen in One Piece, and his mastery of this power is even greater than that of Luffy.
Rocks D. Xebec
- Rare Haki Type: Voice of All Things, Immortality Counter, Conqueror's Shockwave
Rocks D. Xebec is a legendary pirate in the One Piece world whose strength far surpassed that of even a Yonko. As is the case with many old-generation fighters, Rocks did not possess any Devil Fruit ability. Instead, Rocks relied purely on his Haki in combat.
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Rocks possessed a very rare application of Haki that allowed him to counter immortality. On top of that, on God Valley, it was quite clear to see that Rocks could also use the Voice of All Things. Above all, he was able to produce Conqueror's Haki shockwaves with his sword that could destroy everything in their path.
Gol D. Roger
- Rare Haki Type: Voice of All Things, Immortality Counter, Conqueror's Shockwave
The Pirate King, Roger was an incredibly powerful Haki user and it is no surprise to know that he could use all three with great mastery. Roger could also use the advanced forms of all Haki, and he even had some rare Haki abilities to add to it. Fans know that Roger could use the Voice of All Things ability, and that is how he became the Pirate King in the first place.
It is also quite clear that Roger could counter immortality with Haki, and he also possessed a unique ability that allowed him to produce Haki-based shockwaves with his sword.
Shanks
- Rare Haki Type: Conqueror's Shockwave, Immortality Counter, Observation Killing, Long Range Haki, Haki Communication
When it comes to the mastery of rare Haki types, it goes without saying that Shanks is the most powerful one seen in One Piece. Shanks has complete mastery of all three types of Haki. Not only can Shanks counter immortality with his Conqueror's Haki, but just like Roger and Rocks, he can produce powerful shockwaves with his blade.
On top of that, Shanks can even use Conqueror's Haki from miles away and incapacitate someone as strong as an Admiral. If that wasn't enough, Shanks can also communicate with others using his powerful Haki. Finally, Shanks has the unique ability of using his Conqueror's Haki to kill the Observation Haki of his enemies altogether. So far, this ability is unique to the red-haired Emperor.
Imu
- Rare Haki Type: Immortality Counter, Haki Communication
Imu possesses tremendous Haki and that is no surprise. On God Valley, Imu's Haki was known to be even stronger than that of Rocks D. Xebec. While the advanced and rare applications of Imu's Haki are not known yet, fans know very well that Imu can most likely counter immortality with Haki if they feel the need to do so.
Imu can also communicate with the Five Elders as well as the Holy Knights, which is most likely an advanced Haki application as well.
Joy Boy
- Rare Haki Type: Conqueror's Knot, Immortality Counter
When it comes to pure Haki strength, Joy Boy, along with Shanks, is at the top of the One Piece world. In the Egghead arc, Joy Boy showed a type of Conqueror's Haki that fans have not seen yet, and it could be used via a knot. This knot held Conqueror's Haki for centuries and eventually unleashed it in the Egghead arc.
Joy Boy can most certainly also counter immortality with Haki and it goes without saying that he has other rare Haki subtypes that fans do not know about.