My L4D Survivor figures are based on some friends I'd regularly play the game with, as we all might appear geared up for the zombie apocalypse.
Bill is based on a friend I've known since we were both about 6. I wanted his character design to be mostly civilian based to distinguish it from the Sally Squad Medic figure I made of him, but went with the desert themed colors so it would still have a military aspect to it, as he is a Marine.
Roc General Clayton "Hawk" Abernathy - Torso, upper legs
Terminator Salvation Marcus - Jacket and arms
XMO Wolverine - Lower legs
Anson Trask - Head