I liked the Blood Mage in Warcraft 3: Frozen Throne.
While the Blood Elves in WoW are prissy, feminine idiots, the Blood Mage was more of a scarred man, with the curse of his magic forcing him into infernal magics. The model is well prepared, and my favorite part is the idle 'laugh' animation, showing just how far the once-proud mage's sanity and need for magic has corrupted him.
The voice actor also pulled off a good job, with a good charismatic voice backed with slight tones of madness.
"My blood cries for the vengence of my people's blood, which only be repaid with twice as much blood, or three times as much blood. Like if you went to Hell, and it was full of blood, and that blood was on fire, and it was raining blood! That might be enough, but I hardly doubt it..."