Male: Vixen, Catgirl, Tsundere, Prince, Amazon, Rival, Elf
Female: Paladin, Rival, Prince, Orc, Archmage, Vixen, Elf
Becasue why the hell not? I never saw the vixen as one who would care where the jollies were coming from, Elves are (usually) bi by default (and make her a real challenge).
As of for putting Rival in both... well, let the yaio fangirls have their fun. If I can have fem-tagonist on vixen, they should be able to have something too.
But romance isn't a big focus, so meh. If this does come to fruition, though, please consider expanding from what you listed to above.