A scruffy looking fellow, Moore is one of the Master's failed experiments in trying to awaken psychic powers in humans, as he is quite clearly insane. Moore is a pyrokinetic-dominant psyker. These powers are apparently suppressed when Moore is fitted with a psychic nullifier.
Moore proves to be quite unintelligible when the Vault Dweller encounters him. The only useful information he can provide is that "Gideon speaks the way", with regards to the Vault Dweller reaching the Master himself.