Okay, I've got a character.
"TJ Harkweather"
TJ is a large, angry man with a dirty blonde mullet, worn out jeans, black combat boots, a black trenchcoat, a shirt with a picture of a skeleton coming out of a bullet wound and giving the finger, and an unkempt mustache. A year ago he walked into a bank, stood in line, punched a little old lady in the face, jumped through the teller counter and grabbed a few wads of cash, flashed the security camera, ran out to the parking lot, pranked a guy with a tire iron, stole his car, tore down the interstate taking potshots at traffic, eventually came to a 7-11 out in the desert, walked in, killed the cashier, stole a pack of cigarettes and a few twinkies, blew up the gas station, and then proceeded to walk down the highway eating twinkies until he was apprehended by a police helicopter. He killed a guy while waiting for trial over a disagreement about wether superman or batman would win in a fight. He self-represented in court and his defense used 155 instances of profanity. He was sentenced to death and executed by lethal injection.
The next thing he remembers is beating the shit out of an unfortunate mortician.
Yes, TJ Harkweather cheated death thanks to demonic intervention. His demon is Ryanak, from the circle of (what else) wrath, who takes the form of a skinless, eyeless human with a mouth filled with flame.
His power? "Ultraviolence", which is TJ's term for flying into a psychotic rage where he gains a massive healing factor and the ability to kill people in reality defying ways. Like, picking up a bicycle, working the pedal with his hand, and cutting someone in half vertically by using the wheel as a saw blade.
Or ripping a stop sign out of the ground and using it as a battle ax.
Or anything involving a weedwhacker.