I thought about that as I was reading Shen's, the vampire vs. werewolf trope! I was really surprised how much sense their species' alliance would make! 

I also find that they're kind of an offset version of the "stoic vampire/wild werewolf" archetypes, cause stoic vampires tend to be aloof, whereas Shen's just kinda...being Shen, just doing his own thing, and I've never seen a werewolf as upbeat as Hachiro. Reckless, maybe, but not upbeat. I like that about them!