I'm not getting my hopes up, but I see a lot of potential for Ryuugasaki to be a closeted trans girl that uses drag as an outlet (not uncommon among trans girls). He dresses as a girl full time even from a very young age, he shows signs of gender dysphoria when he didn't want others seeing him after not getting enough sleep, and it would make a lot of sense that he doesn't generally need makeup because he's started hormone therapy (or at least blockers). It's a nice headcanon I'll hold onto, but I sincerely doubt the author would go there.