I had a character who claimed he was a vigilante, indeed his targets were evil men, but he had a passion for fire, and was not above torture for information. Basically, my intro involved body horror as he cut the eyelids, fingers, toes, etc off a criminal to find out where a a drug lord was, all the while laughing and just enjoying himself as he mentally played with the dude. Oh, then he burned him alive. Turned out he was at the top of an apartment building, mostly full of civilians. That didn't stop him, he burned the place to the ground in a manner in which nobody escaped. Women, children, pets. They all died in the fire he set. He also gunned down the fire truck that was on its way to help put the fire out. So yea. Not a particularly nice guy. His past wasn't even really tragic enough to justify losing his mind like he had.