Durden
The TylerDurden gang shows up every once in awhile, they are a fun way to improve your shooting skills. They show up with a spawn sometimes between 75 and 110.
TylerDurden, MarlaSinger, and RoberPaulson
These three can only die once all of the other Durdens have died. They are considerably Difficult to shoot and should only be attempted with a well trained gun.
Danger
All Durden NPC return fire! So, if you attempt to kill them and fail - they will try to kill you!