The Glen
Legend
The bad guy from Baldur's Gate 2 is possibly one of the best D&D villains created. Not just because the awesome voice acting but the dialog and slow reveal of his motivations. He goes from an evil wizard with a penchant for torture to someone much worse. He would have succeeded if his sister would have just followed orders too. Just about every line of his dialog is quotable, and just drips with arrogant malevolence.