The gender of Yamato in One Piece has been a topic of debate among fans. According to the One Piece Visual Dictionary, Yamato was born as a female biologically and was even called the Oni Princess. However, Yamato identifies as male and is referred to as such by Kaido and others. In One Piece Chapter 984, it was revealed that Yamato is a woman who calls herself a man to mimic her idol, Oden Kozuki. Yamatos gender identity has never been fully resolved, and the character has been treated as both male and female in different instances. Some fans argue that Yamato is bigender, which is a gender identity for people who experience exactly two different gender identities, either both at the same time or switching between the two. Ultimately, the gender of Yamato in One Piece is a complex issue that has not been definitively resolved.