Francis

Francis is one of the survivors. He is a large, tough biker with tattoos on his arms and neck. His tattoos identify him as a member of "Hell's Legion", a name possibly inspired by the real-world Hells Angels Motorcycle Club. Since his character model has changed, it has been speculated that Francis' new face was modeled after the head developer of the game, Mike Booth and that he has the Lambda symbol from Half-Life cut into his hair. In the official media, he is always seen wielding either the pump shotgun or the auto shotgun.

Official description
Cocky, loud, and pretty sure he's indestructible, Francis acts like the zombie apocalypse is the world's biggest bar fight. When the virus hit, everybody else stockpiled food and looked for a place to hide. Francis found a gun and had some fun. No cops, no laws, no order—if it wasn't for all the zombies, he could almost get used to life like this.