Omusubi was a thickset man with a notably large head which was shaped like his namesake omusubi (rice ball). He wore notable dark makeup around his eyes and mouth, and also had a design of a half-circle encircling a dot tattooed on his chin. He had long and thick dark hair which reached to his shoulders, and wore a rope around the top of his head whose two ends pointed upward at the front. He also wore a kimono and a long cape.
Like his fellow daimyo Shimotsuki Ushimaru and Uzuki Tempura who were imprisoned with him, Omusubi was a very honorable warrior. He refused to battle over food due to hunger, being more than willing to give it to Kaidou's daughter Yamato. Loyal to the Kozuki Family unto death, Omusubi refused to submit to either Kurozumi Orochi or Kaidou and so went to his grave battling the latter and helping his daughter Yamato to survive for the good of the prophesied battle in 20 years.
Abilities and Powers
Omusubi appeared to be a powerful samurai. Wielding a single katana, he was shown to be able to cut through a large rock alongside Ushimaru and Tempura to gain freedom from the cave they were imprisoned in. However, they ultimately proved to be no match for Kaidou, losing to him and his forces on two occasions and dying in the second battle.
Omusubi governed over Kibi as its daimyo until 20 years ago, when Kurozumi Orochi, who had recently usurped the shogunate from the Kozuki Family and had its heir Kozuki Oden executed, gathered all the daimyo and gave them the choice to submit to him or die. The daimyo all refused and staged a rebellion, but were defeated by Orochi's ally, the pirate Kaidou, and his crew the Beasts Pirates. Omusubi, Shimotsuki Ushimaru, and Uzuki Tempura were captured during the battle and imprisoned in a cave on Onigashima until their spirits broke and they submitted to Kaidou.
Sometime later on, Kaidou had his young daughter, Yamato, imprisoned in the same cave for claiming to be Oden. He decided to play a cruel game by leaving the four prisoners only one bowl of food, as well as swords for them to use to fight over it. However, the samurai immediately gave the food to Yamato, refusing to take it according to the samurai code. The three daimyo were friendly to Yamato, and when she revealed she wanted to read Oden's logbook which was in her possession, the trio immediately began to help her as they themselves were interested in its contents. Ten days passed, and with Kaidou seeming to have left the four of them to die, the samurai decided to break out and mount a final assault against the pirate and thus allow Yamato to be freed. They used the swords Kaidou had left them to cut through the large stone blocking the entrance, and went to confront the pirate. However, they presumably met their doom during this conflict.
- "Omusubi" is another name for "onigiri", the term for Japanese rice balls. This is another instance of Wano's administration possessing Japanese food-themed names.
- Omusubi's concept art first appeared in Yamato's gallery section on her Vivre Card - One Piece Visual Dictionary entry, released three days before Omusubi's debut in the manga.
- One Piece Manga — Vol. 101 Chapter 1024, Omusubi makes his debut.
- SBS One Piece Manga — Vol. 101, Omusubi's name and title are revealed.
- One Piece Manga and Anime — Vol. 93 Chapter 942 (p. 10-11) and Episode 940.
- Vivre Card - One Piece Visual Dictionary (Card #1578), Information about Yamato is revealed.