I really don’t think Yamato is comparable with someone like Kiku who referred to herself as female, despite previously being referred to as a brother, out of a dedicated lifestyle rooted in the heart, mind, and soul. I suppose a more comparable statement can be made in regards to Kawamatsu referring to himself as a kappa even though he used to be called a fishman.
Yamato doesn’t seem to be referring to herself as a male as a gender lifestyle choice, but out of desperation to keep Oden’s will alive in wanting to escape Kaido’s abuse and save Wano’s citizens, especially after it was made all the more difficult after Kaido shot Oden to his death. This combined with Luffy telling Yamato she can’t just copy Oden, along with her telling Luffy “Fine, you be Oden then.” very much inclines me to conclude that, and that it’s possible to be yourself while still keeping someone else’s will alive.
Yamato doesn’t seem to be referring to herself as a male as a gender lifestyle choice, but out of desperation to keep Oden’s will alive in wanting to escape Kaido’s abuse and save Wano’s citizens, especially after it was made all the more difficult after Kaido shot Oden to his death. This combined with Luffy telling Yamato she can’t just copy Oden, along with her telling Luffy “Fine, you be Oden then.” very much inclines me to conclude that, and that it’s possible to be yourself while still keeping someone else’s will alive.

I'm mentally prepare myself for that



