Manuel Gregg is a member of the McCoys community. He is usually in the watchtower.
Not much is known about Manuel's life before the apocalypse, unless he was a burger flippers from the McCoys restaurant.
When the apocalypse began, Manuel join with other McCoys workers to survive in this new world. Together they formed a community near where they used to work. Manuel will give you the quest "Circle of Wagons" if Joe say that is looking for work.
Outcome 1: Alive
The Survivalists can make the McCoys and the Fat Neils make the truce.
Outcome 2: Alive
The Survivalists strike the McCoys camp leaving Manuel as the only survivor.
Outcome 3: Dead
The Survivalists strike the McCoys camp leaving no survivors.