Hecataeus is possessed with a formidable intellect, innate arcane talent, and unquenchable determination; he quickly rose to become a formidable wizard. Unfortunately, all his gifts are undermined by impoverished judgment, a craven nature, and his imperious manner.
Some really interesting dialog being generated on this character. Perhaps I am taking too simplistic a view, especially with regard to the killing component, but we're talking about an RPG character. What better vehicle to put one's imagination to the test - play a powerful, highly intelligent wizard that is clearly unstable. There's no mental challenge to being the bully in the little villain school yard, but the nerd that gets beat up and humiliated every day is always scheming. One day he'll emerge from the dungeon with his newly created construct and use it to ambush the bully, pants him (or robe him?), and hang him upside down from from the nearest parapet for the world to see...maybe he'll kill him, maybe he'll turn him into dung shovel in the stables. That's the beauty of unpredictable instability, especially when role-playing...your creativity is the limit.
You get my vote Hecataeus!