Kim Possible (can have a good ties with Shego)? Sailor Mars from old anime "Sailor Moon"? Velma from "Scooby Doo"? Gadget from "chip and dale"? Summer Smith from "Rick and Morty" (She is legal)? Lola the Bunny (this one is really became forgotten)? Ms. Bellum from "The Powerpuff Girls"? Amy Rose from "Sonic"? Paulina Sanchez from "Danny Phantom"?
I tried to pick up those who, IMHO, are hot, but at the same time not very popular right now and also from old era shows. Please tell me what do you think about this characters?
Also, I think Ten-Ten from Naruto could do the trick. She is cute but not very popular, but deserves some attention or she will die as a virgin with all her weapons and not successful armory shop.