Jan Valentine (I know, stroking my own ego, but leave me alone, I love the guy.)
There's plenty of vampires in anime. But you can't beat a psychotic, genocidal, bio-engineered, chainsmoking hitman chav vampire. Especially not after he took the modest P90 PDW, and turned it into a 40-inch scoped handheld machinegun. And then dual-wielding that aberration of a firearm.
That takes dedication. And money. Assassin money.