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Name: Mithias Aldaric Varomere
Age: Several hundred is your best guess.
Appearance:
Personality: Does a hunter really care what a vampire's personality is? As far as they know, he is merely a bloodthirsty animal, a sorry soul who fell to darkness for his sins. Perhaps hatred or vengeance drives his thirst. All that is known is he is powerful, lethal, and in cahoots with the necromancer.
Weapons: Just to be sure I don't make something up on the fly, here are Mithias' weapons: twin swords he keeps at his sides, three daggers with backward pointing prongs and a groove for letting blood, a bola, a whip, and steel vambraces on his forearms. he is wearing a black cloak and has a gold ring with a red gem on his right hand. ...don't think it couldn't be used as a weapon.
Abilities:
I'm going to assume vampires have increased strength and speed and healing, and merely elaborate on the extent I expect of them. Mithias is strong, but it is not his best ability. Like, he shouldn't be able to wrestle a werewolf and win. His speed is amazing however. Catching arrows out of the air would be easy. He might even have a chance to parry a bullet, but that would also take luck and preemption. He has excellent spatial awareness, such a being able to strike behind himself without looking, and he has completely mastered that whip. He heals nearly instantly when well fed, less rapidly when deprived of blood. In fact, all his power is fueled by blood, as you can imagine. His primary power is that he cannot be mind-controlled by other vampires or supernaturals, nor can he have his mind read or be tricked by illusions or any mind manipulation. Lastly, I would like to give him another power, the ability to control heat and create and control fire. I don't plan to throw fireballs, but he could ignite that whip of his.
Backstory: I have a backstory, but man does it have spoilers. Right now, can I just say his name is known, and his age and lineage isn't? You may want to pm me about the necromancer to figure out what their mutual plans are and how they came to work together.