The protagonist of One Piece, Monkey D. Luffy is one of the Four Emperors of the Sea, and he attained this title in chapter 1053, which was released officially on June 20, 2022, in Shueisha's Weekly Shonen Jump Issue #29. Since then, Luffy has been considered a Great Pirate sailing the seas of the New World.
As is expected of someone like him, Luffy has incredibly powerful Haki of all three types, which he has taken to an advanced level. He is one of the very few characters to have mastered the advanced forms of all three types of Haki. Now, the creator of One Piece, Eiichiro Oda, is lining up a new Haki form for Luffy in the form of Observation Killing, which has only been mastered by Red-haired Shanks to date.
Monkey D. Luffy was trained by none other than the right arm of the Pirate King, Silvers Rayleigh, in the ways of Haki. Luffy's training with Rayleigh began officially in One Piece chapter 597, which marked the end of the first half of the story. After the two-year timeskip, Luffy returned to the Sabaody Archipelago having mastered the basics of all three types of Haki: the Color of Observation, the Color of Armament, and finally the Color of the Supreme King.
"Haki is a power that is dormant in everyone everywhere. The ability to sense spiritual energy and overwhelm enemies is something everyone has to some degree. But most people never discover it. To never doubt- that is true power. Now watch! Most Haki can be divided into two types or colors." — Silvers Rayleigh introduces Haki, One Piece Chapter #597
Over time, Luffy engaged in high-level battles and took his Haki to the very next level. By the end of the Wano arc, Luffy had advanced all three of his Haki to the next level, being able to see the future with the Color of Observation, deal internal damage without making any contact with the Color of Armament, and learn how to infuse the Color of the Supreme King as well. However, Luffy's Haki can still improve even further, and Eiichiro Oda has now set up a new Haki form for him with Observation Killing. The basis for this new power-up was set by the author Eiichiro Oda on August 6, 2022, when he released Volume 4 Billion for the very first time. This volume was initially released for the celebration of One Piece Film Red, a very popular movie centered on red-haired Shanks.
“Shanks — Killer of Observation Haki
Doesn't let the enemy read him by controlling his presence with the Color of the Supreme King”
— One Piece Volume 4 Billion explains Observation Killing
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