In my personal opinion I think Yamato just idolizes Oden to be strong and tough like he is. She’s just a classic tomboy, tough girl and she speaks like a typical yankee style female character. If anything yamato comes as warrior type character and mentality. I’ve always thought that Yamato may have grew up in an environment where she may raise and brought up as man. She doesn’t live her life as a normal girl. There are plenty of anime characters that are quite similar to Yamato in there own Personality. In chapter 994 Yamato doesn’t even classify there gender at all when the person says “My other name is Yamato and I’m willing to die for you”. In chapter 996 when Yamato says oden’s would never do such thing. It’s more moral obligation or warrior code to protect those around you. I kind compare girls you would
See from series like kill la kill, beelzebub, zombie land saga, fruit basket, Rokudou no Onna-tachi, and pashiri na boku to koisuru