Alistae is a Void elf warlock now serving the Alliance. He was a very bright Blood elf back in his d

Alistae is a Void elf warlock now serving the Alliance. He was a very bright Blood elf back in his day, but after years of war and using both Fel and Void magic, its taken its toll on both his body and spirit. 
As both Fel and Void are heavily corrupting powers, you’d have to be pretty in control of yourself to harness both of them. The fel has kind of fought back, but otherwise Alistae has taken the responsibility easily, his slight sociopathic tendencies and apathy might have helped keep the balance a little. 
Of course his corruption into the void is only recent in comparison, and only time will tell if his will is powerful enough to take it. 

Alistae no longer has any close family, and his only love is for his companion rat, Timmy, whom he found in Dalaran underbelly. The rat wouldn’t stop following him around, and after calling him Timmy as a joke, it kind of stuck, and so did the rat.