It would be a mixture of a melee fighter and the wizard (kind of like the assassin was a mixture of classes in D2). The character itself could have an Eastern European taste, like Vlad Tepes. His resource could be "life energy" (or blood?) and he could gain it the same way the Barbarian have some attacks that generate Fury.
Thematically, it could be a warrior looking for redemption.
If we remember, Dracula could walk during daytime, he was just weaker. A good twist could be having stronger powers for the vampire during the night, weaker powers during the day.
This would require the game to have a Day/Night Cycle. But hey, it's an expansion!
How about have someone actually lore friendly.
I'll say a strength based valkyrie: spear shield orientated holy warrior.
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