Darius
Unfortunately, I haven't had much control over this character that I can remember, so I couldn't tell you much about personality or appearance. I can tell you about his powers, though, in a general form:

Darius is a necromancer, and a skilled one at that. While he might have a charm or two to do things like throw fireballs, the bulk of his training and magic have to do with communicating with and summoning the dead, or with the application of death and decay on living objects. And don't start thinking of a D&D-ish necromancer, who can summon legions of animated zombies and skeletons to fight for him; while Darius might be able to do that, it would require days or weeks of preparation, special spell components, and would utterly drain him.

For the most part, Darius is simply able to speak with the dead and gain knowledge from them. He can summon ghosts if he feels like it and force them to do his bidding, but that rquires a fair amount of preparation as well. I would imagine the kinds of spell components he'd use would be things like ash, bones, and some article of the deceased's (if he was trying to summon and bind a particular ghost). His spells and magic would be disturbing and mystical in nature, with the air of a seance or visiting Dracula's castle, rather than a lot of pyrotechnics and strange words flung about.