Something interesting about this Ly'lac being Black thing is that it kind of means Rose is also Black because she's put all of her thoughts and feelings and projected hard to deal with problems onto this race that she's created for the game between her and Dirk. And so, the Nymph's have obvious features that relate to Rose as we the readers know her. They look like squiddles, they're purple, they have a gothic theme etc. But there's other aspects about each Nymph that we've seen that don't so much relate to Rose as knew her, but that add more to her IMO. They recontextualize her as Black in a way by giving her a space to vent frustrations she might not have been able to.

The Nymph's, for one, not only exist in a pretty gendered society where things are strictly female, but they are also an under-represented class of people in a different way then women are. It's not that all of media is just about men but that there are barely any Nymphs around. Ly'lac's a girl, and there are plenty of girls in the media she watches, but NO satyrs which I feel is what makes it a distinctive racial allegory and not one that's only about the gender of the characters.

And if Rose added this dilemna to her species it begs to question why? We can see she added all sorts of things that are obvious projections of her own childhood trauma onto these cute little Nymph's so what does it say about Rose that being a "Nymph" is akin to race and not necessarily just gender? Food for thought.