This would be nice. I'd love to have people in bookd be different genders, races, religions, sexualities, degrees of neurotypicality, body types, physical abilities, etc., not because the story is about that, or even because it's relevant to the story, but just because people are like that. Like in Friday[1], Georges is French-Canadian. Not because there was any particular reason for him to be French-Canadian, but just because some people are. Since I lived at the opposite end of the US from Canada, and since I was reading Friday as a tweenager[2], this was my introduction to "French-Canadian" as an identity. People need experiences like that, even small ones.

[1] Which is one of my all-time favorite books, despite its problematic elements.
[2] Which in retrospect probably would have scandalized my mother had she known what I was reading.