Vash was supposed to be a vampire, but by the definition of one he wasn't even close. Physically, sure, but with how he acted he might as well be a puppy!

When you first stumbled upon him he was like any other person you may find on the streets of Gunsmoke, that was until you saw the pointed teeth and ears. He of course waved it off saying you were drunk

Which brings you to now he was snuggled up on your lap with you scratching his head, while Vash was just purring like a fucking cat!