There is an interesting concept as to what is the limit as to defining oneself. On a less extreme level, take the person born in Country X, but who really likes the people and culture of Country Y, to the point he dresses, talks, and acts like Country Y citizens, perhaps even moving to Country Y. He declares himself a Y person--even though most would say he's not, he's not a Y citizen, and is from a different race/ethnic group than the Y people. He defines himself, and identifies, as a Y person. There is something free about allowing people to be who they want to be and identify as who they think they are.
I think there were plenty of Caucasians, and part-Caucasians, who became Comanches after being kidnapped (or their mothers kidnapped), including their greatest war chief (greatest in recorded history anyway). But I think that culture (Comanche) valued fighting ability above all else, so they didn't really care whether you were fair skinned, brown, or black. (as far as I know) If you could fight, and adopted their ways, you could become one of them, and they would accept you.
With sex/gender, it's a stickier situation, as modesty concerns make having a person with a cock in a female locker room problematic. It also goes to the very definition of male and female.
The more traditional approach is to call such a person a man with a kinky* habit of dressing up and acting like a woman.
*not this guy
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Last edited: Jan 26, 2021