Yamato

Yamato is the son of Kaidou. Born as Kaidou's daughter and groomed from a young age to be his heir, Yamato instead developed a profound admiration for the samurai Kozuki Oden. After his death, Yamato chose to become Oden, impersonating him and adopting his mannerisms. As a result of this desire to become Oden, Yamato decided to become a man and identify as Kaidou's son, and Kaidou and his crew refer to him as such as well.

This path has put Yamato at odds with Kaidou, with much of his life being spent imprisoned on Onigashima. Yamato befriended Portgas D. Ace during his visit to Wano Country, and after learning of Ace's death waited for the arrival of his sworn brother, Monkey D. Luffy. Together with Luffy and the Ninja-Pirate-Mink-Samurai Alliance, Yamato helped defeat Kaidou and the Beasts Pirates, and now intends to join Luffy's crew upon their departure from Wano Country.

Yamato is a major ally during the Wano Country Arc.