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Blood Letter Omasa is a yakuza boss who was in charge of the Udon region in Wano Country. He was imprisoned in Udon by the Beasts Pirates, but was freed when Luffy took over the prison.[1][2]


Omasa is a large man with light colored hair, with two braids at the front of his face and bells at the end of them. He has thin whiskers and a large scar over his right eye.[1]


Omasa Portrait.png
Close-up of Omasa's face.
Omasa Anime Concept Art.png
Omasa's anime concept art.
Omasa Beasts Pirates Disguise.png
Omasa disguised as a Beasts Pirates member.


Being a yakuza boss, he had the respect of his followers from Udon, as well as the other yakuza bosses of his time, being able to work alongside them.[2] He seems to highly respect Hyogoro, and would threaten those who offend the elder as well as obey his commands.[1] He is also caring and brave. After he was infected by the Ice Oni virus, he was willing to commit suicide to prevent himself from attacking and infecting his comrades.[3]

Abilities and Powers

Physical Abilities

Omasa seems to have enough strength to hold down a struggling Luffy while the latter is being punished for his rudeness.[1]



At a certain point in his past, he became the yakuza boss of the Udon region of Wano Country. After the Beasts Pirates took over the country, he opposed them and ended up in the Prisoner Mine in Udon.[1][2]

Four Emperors Saga

Wano Country Arc

After Monkey D. Luffy led a rebellion in the prison, Omasa was freed with the rest of the prisoners. The yakuza bosses later approached Hyogoro to show him respect, and upon seeing Luffy's casual way of addressing Hyogoro, they tried to punish Luffy, only to be stopped by Hyogoro. The bosses then let Luffy go and left to recruit their followers from across Wano.[1]

Two days before the raid on Onigashima, Omasa and the other yakuza bosses contacted Kin'emon and informed him of the number of allies they had recruited.[4]

The rebels gathered at Habu Port and on the day of the Fire Festival, they joined the Nine Red Scabbards at Tokage Port on a fleet of ships.[5] After the alliance infiltrated Onigashima, the rebels received Beasts Pirates disguises from Kin'emon. Omasa then joined Denjiro in the southern forces.[6]

Later, as the Ninja-Pirate-Mink-Samurai Alliance waged war in Kaidou's stronghold, Omasa struck down some Beasts Pirates.[7] After he was infected with the Ice Oni plague unleashed by Queen, Omasa was about to kill himself, but Hyogoro stopped him.[3] Omasa later completely transformed into an Ice Oni before Zoro acquired the antidote from Apoo.[8] When Marco used his flames, Omasa regained his senses. While Chopper worked on mass-producing the antidote, the yakuza leaders and X Drake guarded him.[9]

As Omasa was succumbing to the Ice Oni virus again, he requested Tsunagoro to end his life. However, Chopper managed to successfully mass-produce the antidote and cure all the infected, including Omasa.[10]


  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 One Piece Manga and Anime — Vol. 94 Chapter 952 (p. 8-10) and Episode 946, Omasa makes his debut.
  2. 2.0 2.1 2.2 2.3 One Piece Manga and Anime — Vol. 93 Chapter 940 (p. 16) and Episode 937, Hyogoro talks about the yakuza bosses.
  3. 3.0 3.1 One Piece Manga and Anime — Vol. 98 Chapter 994 (p. 9) and Episode 1007.
  4. One Piece Manga and Anime — Vol. 95 Chapter 955 (p. 10) and Episode 956.
  5. One Piece Manga and Anime — Vol. 97 Chapter 975 (p. 14-17) and Episode 979.
  6. One Piece Manga and Anime — Vol. 97 Chapter 979 (p. 3) and Episode 984.
  7. One Piece Manga and Anime — Vol. 98 Chapter 990 (p. 10) and Episode 1001.
  8. One Piece Manga and Anime — Vol. 99 Chapter 997 and Episode 1010.
  9. One Piece Manga and Anime — Vol. 99 Chapter 998 (p. 4-7) and Episode 1012.
  10. One Piece Manga — Vol. 100 Chapter 1007.

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