The Whisper

 was a vigilante on New Vegas. He attacked the cafe where Rose Tyler worked and killed most of the customers. He punished people for minor crimes, such as street art, with death. He tried to kill James McNeil. The whisper turned out the be the wife of one of Cyrus Wolfsbane's dead workers, Lillian, James' daughter. The Whisper was killed by Wolfsbane. (AUDIO: Night of the Whisper)