Edgar (Fallout 3)

 was a member of a small commune who lived at the Hilltop Farm ruins.

Background
Apparently, he was the group's engineer as he set up the power generators, the terminal at which all the entries are found and the windmill outside the farmhouse.

Appearances
does not actually appear in any game but terminal entries from and about him can be found in a terminal at Hilltop Farm ruins in Fallout 3.