The Vault 11 Survivor is a cut character in FNV, the only survivor of Vault 11's inhumane experiment. His original purpose, as per the events in game, was to be found somewhere in the Mojave, spreading the word about what happened in Vault 11.  He would, if pried, tell the player the location of Vault 11 in addition to what had transpired there. However, understandably, it will be a difficult thing to talk about with him...