Sister

 is a man found in Rivet City. He is an unapologetic Slaver, and, at Eulogy Jones' request, is in the city to capture an escaped android. In his room is a recording pertaining to the quest The Replicated Man, concerning the Slavers' desire to enslave some androids. However, Sister has grown to like living in Rivet City, for which he has abandoned this mission indefinitely.

Conversation with him is less than verbose: he has a simple goal and wants to discuss nothing but that. If asked about his name, Sister will refuse to go into further detail.

Unmarked quest: Slave Hunt
When you first meet Mei Wong she seems very scared because she is afraid of Sister. You can help either Mei Wong or the slaver and receive good or bad Karma based on your actions.

Appearances
only appears in Fallout 3.