I have a 4th Ed I may be able to bring out of retirement for this.
Here's the idea.
He's an Orc known only as "Smiling Jack". His standard wardrobe is animal pelts and body armor with painted on orcish symbols- most notably a green orcish version of the "Have A Nice Day" face on his chest. His body is absolutely covered with scars like he survived a "Death of 1,000 Cuts" and his smile rarely leaves his face. Mostly because he's certifiably insane with a freakishly high tolerance for pain.
While his past is unknown, it is believed that at one point he was a faceless private security company mook whose unit was sent to lean on some eco-hippies. The hippies proved to be better magically prepared then people thought though as they released a curse on the security soldier unit, one that caused their bodies to suddenly, completely, and violently reject their cyberware. However during the raid "Smiling Jack" displayed signs of a conscience- he was ordered to go into one of the huts and kill everything that moved but discovered the colony's children, so he lied to his CO rather then go through with it. It appears the curse decided to go easy on his as a result- it worked through his system slow enough that if he was willing to cut out most of his cyberware by hand with a knife he'd survive.
So this giggling maniac of a runner who looks like a complete savage has no past, little records, and a near-encyclopedic knowledge of guns, body armor, and security forces tactics. Using, acquiring, and repairing. If you need someone to hotwire an Ares Corps humvee and blast out "Born to be Wild" while firing the mounted 50 cal backwards and steering with his toes, you found your man.