Gromph Baenre is one of the three most powerful magic users on the planet, and as of the most recent book I've been reading, is also currently learning Psionics. He is learning it from an associate of his brother, Jarlaxle Baenre, a close friend of Drizzt. That's actually how he released the Demons, trying to mix magic and psionics. Until then, he was the Archmage of Sorcere, the Drow school of magic. After the demon fiasco, he fled the Drow city of Menzoberanzan and went to the surface, joining with those who were rebuilding the Host Tower. (Though, one of the main reasons he fled is that he quite literally climbed as high as a Male in Menzoberanzan possibly could, and even then he was considered "Just a Male". Even as, arguably, the most powerful being in the city, he was still "Just a Male." So he left.)
He's evil, but he's Lawful Evil and has no compunctions working with a bunch of do gooders if it'll get him what he wants. He mostly does what he says he will, but he is a Drow.
You know, if you decide to use the character. Which may or may not make me geek out tremendously.