Ironically, one of the healthiest relationships in Polychrome Heroics is a quiet little villain/villain F/F. Fortressa has declared that she is Through With Men. Okay, fine, she can do that. One of her henchwomen, Socket, has an almighty crush on Fortressa -- and has said absolutely nothing about it, because Fortressa isn't interested in a sexual/romantic relationship. Instead, Socket is just always there for her, fixing up the battlesuit and making sure there's food in the shop fridge and generally trying to make Fortressa's life easier. Because that's what true love is all about. It's not about getting what you want out of the other person. It's that condition in which somebody's happiness in integral to your own, so you do what you can to be there for them, however they want you to. It doesn't have to be sexual. And what started out as a crush is slowly, inexorably, and quite beautifully growing into a squish which is fulfilling for both of them.
To find my asexual, celibate, demisexual, etc. characters, check out the QUILTBAG list.