Sister

is a man found in Rivet City. He is an unapologetic Slaver, and is in the city to re-capture an escaped slave, Mei Wong. Conversation with him is less than verbose: he has a simple goal and wants to discuss nothing but that.

The player has a couple of options (other than ignoring the situation entirely): Aid Sister in recapturing the slave or providing Mei Wong with caps, allowing her to purchase a pistol to defend herself. Obviously, the first provides Bad Karma while the second is worth Good Karma. If you kill him in his sleep with the sandman perk as to not alert security, there is no karma penalty, and Mei Wong will make a comment about how she is happy he is dead the next time you see her. This can be done even after you give her money to buy a gun.

A few days after making your decision, Sister will disappear from Rivet City, ostensibly either to return the slave to Paradise Falls or because he has fled or was killed.

If asked about his name, Sister will refuse to go into further detail. In his room you can find a recording with a female voice, indicating that Sister is an android.