Keith

In Left 4 Dead 2, he is the buddy of the survivor, Ellis. He grew up in Savanah with Ellis together, having all sorts of adventures, They were separated when the infection began, but Ellis still brags about his buddy Keith whenever he gets the chance. Keith has supposedly survived these, as well as several other incidents, as explained by Ellis: Burned on 90% of his body on multiple occasions. Thrown through a car windshield breaking both of his legs. Ran over by his own mower. 90% of his body cut up. Teargassed. Bombed with chemical, frag, and incinerary bombs. Stabbed in the back by a ghost, or possibly a hobo. There is some speculation whether Keith is a real person or not.