Oh! Hmm... lets see. I already got my threshold, so that's not a requirement, though I'd 'prefer' at least domesticated, perhaps owned by another tamer at one point. Though things are debatable! I suppose my original list still applies, and any other suggestions I'll consider!
Pokegirls: Vampire, Drow Zee, pretty much any Elf variant, Youma, Heroine aaand... so many others I can't think of.