Garp's Haki includes all three types, but he's most renowned for his mastery of Conqueror's Haki (Haoshoku Haki), which he infuses directly into his fists, allowing him to unleash devastating attacks like Galaxy Impact without needing a Devil Fruit or weapon, a unique and powerful application that sets him apart. He also possesses advanced Armament Haki (Busoshoku Haki), capable of emitting invisible bursts to strike opponents from afar, and likely Observation Haki (Kenbunshoku Haki), making him a complete Haki powerhouse.
Other One Piece characters channel this power through objects or combine it with their Devil Fruit capabilities. However, Garp infuses it directly into his fists, which means that his Conqueror's Haki and his fists are strong enough to reach the same level as Conqueror's Haki with Devil Fruits or with weapons.
The rarest Haki is Haoshoku Haki (Conqueror's Haki), an innate ability only possessed by one in several million people, allowing them to exert their will over others to dominate them, with advanced forms like Conqueror's Haki Infusion and Conqueror's Killing Haki (Shanks' ability) being even rarer applications. Unlike Armament and Observation Haki, it cannot be learned but must be born with, signifying true kingly qualities and spiritual dominance, with some advanced users even bending reality or preventing others from using Observation Haki.
For now, it is clear that Shanks has a more powerful Haki power than Garp. However, if we go back decades, Garp is the champion.
Garp might have the most unique and powerful Conqueror's Haki because he is one of the very few One Piece characters who don't rely on Devil Fruits or weapons.
As an awakened Mythical Zoan based on a God, Luffy is afforded immense strength, speed, and durability in Gear 5 that outclass the physical enhancement granted by most Zoan powers, including awakened ones, as well as his own Gear 4.
Being the coward, Usopp often lies to turn the tables and make himself feel braver and calmer. Conclusion: Usopp has Observational Haki Foresight that vastly outshines Katakuri's, and he is subconsciously using this ability whenever he lies.
There is a scene where Rogers mentions not having a son. This can't be true since Ace is a son of his. He didn't have Ace during that scene, it's not that hard to understand... And no, Shanks is not Roger's son.
While it was the first time many strong characters in the One Piece world saw Luffy use Haki, he had technically used it unknowingly twice before the Marineford arc: Against the bull Motobaro in Episode 389. Against the Boa Sisters at Amazon Lily in Episode 413.
These two were evenly matched in power. From the side of the Marines, fans know that Garp is the only one strong enough to match Roger, having been said to have cornered him on multiple occasions.
Haki. Joy Boy was one of the very few people in the world who wielded Supreme King Haki. The power of his Haki is monstrous, as the giants Dorry and Brogy considered his Supreme King Haki to be more powerful than that of Shanks', though they noted they sensed no hostility from it.
Donquixote Doflamingo is the captain of the Donquixote Pirates, whose current executives notably started following him at a young age specifically because he possessed Supreme King Haki.
Despite its great capabilities, the Haki in a person's body is not limitless and it can be depleted from overuse, rendering the user unable to use it for a set period of time while it regenerates.
Garp, if had been asked, would have teared it all down to save Ace. But Ace and Garp respected each other to much and both had too much pride. So Ace didn't ask. Garp had to be pinned down at one point in the whole thing at marineford.
Dragon is one of the mysterious and influential characters in the One Piece world. He is known as "The Most Dangerous Man in the World" because of his role as the leader of the Revolutionary Army, a group that aims to overthrow the World Government.
Garp can beat Gear 5 with low effort.
Luffy will surpass Roger, that's 100% true, but he won't become the strongest in the verse. So many people think Blackbeard is Luffy's final opponent, but that's not true. The final war is already shown in the manga, and it's about the whole world going against the World Government.
However, it looks like there is a fourth Haki, which is so rare that it can only be used by Dracule Mihawk and Monkey D. Dragon, the leader of The Revolutionary Forces.
He had an active bounty on his head, and mentioning him was enough to put the Marines on high alert. Thus, if Rayleigh had taken in Ace, he would have placed an innocent child directly in the same dangers that his father, Roger, had been trying to protect him from.
His father, Roronoa Arashi, was killed by pirates, and his mother, Tera, died of illness when he was young. Zoro is a descendant of the Shimotsuki family of Wano Country through his grandmother Furiko, the older sister of Ushimaru, the daimyo of Ringo, who is Zoro's great-uncle.
Alright so here's my theory; During the journey of finding the Poneglyphs and learning about Laughtale and JoyBoy with Roger, Shanks learned the truth about JoyBoy somehow(probably through a haki thing) and that he knew Luffy would become JoyBoy.
Portgas D. Rouge and Gol D. Roger shared a profound relationship, with Rouge being Roger's lover and the mother of his son, Portgas D. Ace. Her deep affection for Roger was evident in her grief upon his death and her decision to name their son using Roger's chosen name and surname.
On the island of Dressrosa he liberates a ground of enslaved toys, earning himself a temporary bounty of 500,000,000 by Doflamingo. This later becomes a permanent bounty of 200,000,000 and the new epithet "God" Usopp (ゴッド ウソップ, Goddo Usoppu).
Shanks Can Kill Observation Haki With His Color Of Supreme King The most rare form of Conqueror's Haki that fans know exists in One Piece belongs to none other than Shanks. It is a subtype of Conqueror's Haki that is known as Conqueror's Killing.
What type of Haki does Sanji have and how does he use it? Sanji is an advanced master of Kenbunshoku Haki. This ability allows him to sense others' presence, strength, emotions, and intentions. He has used it to locate individuals, such as Caribou in the Ryugu Palace and a sniper on a rooftop.