Those Two Bad Guys

Gregory Rasputin (no relation) and Obutsu Dokami, the supernatural mercenaries who work for Moulton & Grandier, a perfectly and totally mundane law firm with no hidden agenda beyond serving justice as honestly and efficiently as possible.

Vaguely inspired by Vince and Jules, Jasper and Horace, Hidan and Kakuzu, Croup and Vandemar - they're a fairly straight example of Those Two Bad Guys, albeit toward the less pointlessly evil end of the morality spectrum.