Is the word minority so attached to race that it’s not used to talk about relative sizes in groups without clarification (if you understand what I mean)?

Yes, but it’s contextual. If someone is a minority, it’s usually referring to being a part of a minority class, often one that’s either protected or used by bigots as a point of hatred.

Being in the minority, however, can refer to having relative uniqueness.

English is hard. I’m sorry it has such stupid rules, but here we are.

I guess you could also say something like, “her body type is atypical” to avoid confusion. From your other comments here it’s pretty clear that’s what you meant. And I agree with you that video game representations of women in particular are often problematic, as they are mostly unrealistic, highly sexualised, and created that way for the primary purpose of being objectified by men.

In this case I think CLM is the closest assessment, because I think it’s obvious to a native English speaker that it could be interpreted both ways, so it should have been clarified before mod action was taken.