Paladin Tristan

 is a Paladin of the Capital Wasteland Brotherhood of Steel who is added to Fallout 3 in the DLC Broken Steel.

He seems to be in charge of a Brotherhood operation involving the player and Liberty Prime, possibly the raid on Olney Powerworks.

Quotes

 * "Well well, look who's back amongst the living."
 * "Basic rule of thumb on these operations; keep your head down and let the robot do most of the heavy lifting."

Appearances
appears only in the Fallout 3 DLC Broken Steel.