I'll sort of respond to how to avoid "us plus fake" based on my current plan to write a luchador.
. . . .
I'm not Mexican, and I've never been a pro wrestler. So how can I write this guy?
For starters, I consider what I know that is relevant to this character.
* I have some cultural knowledge.
* I have some martial arts knowledge.
* I've known people who have similarities to my character.
. . . .
I also have the interest in learning more, even knowing what I write is meant to be like a B-movie in book form.
Thanks, Mr. Legend. I appreciate that you're discussing how you make the effort.