He definitely could be evil. We know he is extremely ambitious and at least in the past he hasn't hesitated to go for power grabs at the expense of others so he's definitely one to keep a careful eye on. Though we don't really know how his story will play out or whether he's changed since his attempt to overthrow Mystra has backfired on him. I plan to follow his story depending it isn't too much of an annoyance to feed his Netherese Destruction Orb though if I have the opportunity to turn on him for power I will, it would only be fair that he has a taste of his own medicine.
