Yamato. with mask. and without it. Yamato (ヤマト Yamato), also known as Prince Oni (鬼姫おにひめ Onihime),[2][3] is the son of the former Emperor Kaidou.[8] Trained from a young age to be Kaidou's heir, Yamato instead developed a deep admiration for the samurai Kozuki Oden. After his death, Yamato decided to become Oden, impersonating him and adopting his mannerisms.[7]

After meeting Monkey D. Luffy, he joined the Ninja-Pirate-Mink-Samurai Alliance in order to defeat the Beasts Pirates and escape Onigashima.

After the war on Onigashima and the defeat of his father, Yamato decides to follow in Oden's footsteps, beginning a pilgrimage throughout Wano to eventually go to sea and experience the same adventures Oden once had.