Cypher

Cypher is Eastern Brotherhood of Steel's spy in the raider camp of Freeport in 2197.

Background
He isn't a member of the Brotherhood, but is sponsored by them in exchange for information. Cypher is a greasy, shifty-eye looking character who fits in well in any bandit or raider camp. He has a knack for blending into the crowd as long as they are bloodthirsty marauders. Taking the average wastelander into account, Cypher is practically invisible.

Appearances
Cypher appears only in Fallout Tactics: Brotherhood of Steel.

Behind the scenes
It seems likely Cypher is a reference to his namesake in the first Matrix movie - (Lu-)Cypher is a spy and a traitor working for the Agents to bring down the Matrix hackers, and almost succeeds.