Explained for the very first time in One Piece Chapter 597 on August 30, 2010, Supreme King Haki has gone on to become an incredibly crucial aspect of the story in the post-timeskip. With the final saga of One Piece slowly building up the war against the World Government by introducing the concept of immortals who can only be wounded by Supreme King Haki, this power is absolutely crucial for Luffy and his allies going into the Great War.
To that end, One Piece's Elbaf arc has officially set up Supreme King Haki for two more characters connected to Monkey D. Luffy, and these are Sanji and Hajrudin. The left arm of Luffy has already been confirmed to hold the power of the Supreme King inside him, but One Piece chapter 1191 also sets up Hajrudin for this ultimate power as the Elbaf arc hurtles towards its conclusion.
Within the ranks of the Straw Hat Pirates, Supreme King Haki was always going to be rare. Monkey D. Luffy emerged from the timeskip with full mastery over his Color of the Supreme King, but other than him, no one else showed the power to utilize it. This changed in the Wano Arc, where Zoro unknowingly tapped into Conqueror's Haki and used it to defeat King. In Elbaf, however, Scopper Gaban, the left arm of the late Pirate King, explained in Chapter 1152 that both Zoro and Sanji held potential to wield the Color of the Supreme King. In the case of Zoro, this power had already awakened but not tamed. In the case of Sanji, this power is being actively suppressed due to his self-deprecation.
Sanji: What about me? Do I have Conqueror's Haki?
Gaban: You too have traits of one who can become a Conqueror. But for some reason, I sense dangerous self-deprecation in you. If you truly want Luffy to become the Pirate King, then you yourself must become a "King.
— Gaban confirms Sanji's Conqueror's Haki, One Piece Chapter #1187
In One Piece Chapter 1187, which was released on July 6, 2026, in Shueisha's Weekly Shonen Jump issue 32, Eiichiro Oda confirmed that Sanji held within him the power of the Supreme King Haki. Now it is up to the left arm of the future Pirate King to bring out this ability in the battle against Killingham and aid Luffy on his quest to become the Pirate King. Sanji gaining the Color of the Supreme King, and Zoro mastering it in the Elbaf arc, is a given. Both of them have been pitted by Eiichiro Oda against two of the most unique Holy Knights, those being Saint Sommers and Saint Killingham. In these battles, these two must master the Color of the Supreme King fully, because, as confirmed by Scopper Gaban in Chapter 1170, only the Color of the Supreme King stands as the ultimate weakness of the immortals of the One Piece world.
"Give him enough hits, and we can manage to knock him out of commission. If these guys have any weakness, it's against those of us who can infuse our attacks with the Color of the Supreme King!" — Scopper Gaban explains the weakness of Immortals, One Piece Chapter #1170
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