Maybe he's not a youkai but a hybrid like tsukune. And you can be right about the vampire thing so my guess is that he got blood from kahlua (I'm sure if it's the command then kahlua won't deny it and inject blood into him)
If he was a real vampire then Moka would know that, but he really has a "vampire-like" strength that's why I think that. I have an impression that he was originally a human...
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