From a young age, Yamato was groomed by Kaidou to be his successor. However, witnessing Oden’s heroic sacrifice left a lasting impression on him, leading Yamato to revere Oden as his role model. Yamato began impersonating Oden, adopting his name, mannerisms, and ideals. This decision, combined with his rejection of Kaidou’s expectations, resulted in years of imprisonment on Onigashima.

During his captivity, Yamato encountered Portgas D. Ace when he visited Wano, forming a deep bond with him. Learning of Ace’s death further fueled Yamato’s admiration for Ace’s sworn brother, Monkey D. Luffy, leading to his determination to aid Luffy upon his arrival in Wano.

Yamato is a tall and athletic individual with long, white hair that fades into a light aqua hue at the ends. His horns, a trait inherited from his oni lineage, accentuate his imposing presence. He wears traditional Wano-inspired attire with Oden’s distinct style, including a loose-fitting outfit and sandals. His kanabo (spiked club) is a weapon of great strength, symbolizing his connection to Kaidou while showcasing his combat abilities.

Yamato is courageous, strong-willed, and deeply loyal to those he admires, particularly Kouzuki Oden and Monkey D. Luffy. His unwavering belief in Oden’s ideals drives his actions, and he strives to uphold Oden’s dream of opening Wano’s borders. Yamato’s rejection of Kaidou’s tyranny and his desire to protect Wano reflect his compassionate and honorable nature. Despite his serious convictions, Yamato exhibits a playful and enthusiastic side, especially when interacting with allies like Luffy.

Wano Country Arc
Yamato played a pivotal role in aiding the Straw Hat Pirates and the Ninja-Pirate-Mink-Samurai Alliance during the Raid on Onigashima. Acting against his father, Yamato helped protect Momonosuke, inspired the alliance with his knowledge of Wano’s history, and held his ground against Kaidou in battle. His resolve to fight for Wano’s freedom and support Luffy solidified his position as a key ally in the rebellion.

Post-Raid Decision
Following Kaidou’s defeat and the liberation of Wano, Yamato expressed his desire to join the Straw Hats. However, recognizing the importance of safeguarding Wano’s future, he decided to stay behind temporarily, vowing to help protect the country from external threats. Yamato’s intent to eventually join Luffy’s crew remains a point of anticipation.

• Kouzuki Oden
  Yamato’s admiration for Oden defines his identity, with Yamato striving to live according to Oden’s ideals and carrying his dream of opening Wano’s borders.

• Monkey D. Luffy
  Yamato holds deep respect for Luffy, viewing him as a kindred spirit and a vital ally in Wano’s liberation.

• Portgas D. Ace
  Yamato befriended Ace during his visit to Wano, forming a bond over their shared dreams and longing for freedom. Ace’s death motivated Yamato to meet and support Luffy.

• Kaidou
  Yamato’s relationship with Kaidou is fraught with conflict, as his rejection of Kaidou’s ambitions led to years of imprisonment and opposition during the Raid on Onigashima.