Steve Davids is the resident psychopath. His mother died at his birth and his family abandoned him and set the house on fire when he was just a child. He was saved by his uncle but Steve was forever tortured by these events, as any one would be. He became psychotic, and murdered several people at a young age before he was enlisted at Hellington Mental Asylum, a now abandoned asylum that was renowned for having only the most unstable of residents.

Steve eventually learned to control these feelings mainly due to the help of his uncle, Blaine.

Steve's Father never forgave him and set out to hurt Steve, he even murdered his own brother - Blaine, in order to show Steve what true pain felt like. He then set out to turn Steve's best friend and girlfriend against him. He was supposedly unsuccessful but Mark and Lacey's intentions are currently unknown as they were caught cheating on Steve in his own house.

This led him to become even angrier etc etc...

I would go on and tell my whole story but then i realized this question was what is your gimmick not the whole story.

What I would say though, is (I think Azrael mentioned it before) have a general plan of where your character is going to go, a big plan so to speak, and then let the character evolve...

3x Xtreme Champion
1x Briefcase Holder
1x Television Champion
1x Universal Champion