Well not so much as, according to many fansites like this one, this character is a homage to a NPC/Super Unique monster in Diablo I. Here he is, Lloigor the Crazed, who is an echo of Zhar the Mad from the first game.
I wasn’t able to get a screenshot when he became a Super Unique monster. Was too busy trying to kill him with my lowbie Demon Hunter. LOL!