Vergil Swifthand (real name Gerard Montgomery) a Devil Hunter dressed in gothic outlaw attire, was well regarded within his sphere of Devil Hunters, he would bring his sorceress girlfriend, Opal, with him on hunts, until one day he bit of more than he could chew, he hunted a Devil of high status in hell, an archdevil, it captured Vergil (cont. in replies)
and brought him to the Devil's portion of hell, he forced Vergil into a cursed blood pact, giving him devilish eyes (Black scleras and red irises) and blood that literally boils when he gets near a Devil or demon, he uses this blood against them, due to the Archdevil's power it can destroy most lower ranking Devils, the Devil gave him this power because
Vergil made a deal to fight him again later down the line as a bargain for his freedom, he changes his name to Vergil after he gets out of hell and meets his now also cursed amnesiac girlfriend, he and a couple other misfits do jobs together, not knowing of Vergil's goals
WOAH!!!