He is one of the Master's failed experiments in trying to awaken psychic powers in humans. Wiggum, while seemingly not as insane as other psykers, is quite clearly depressive. Described as a complete loser, he is wearing a psychic nullifier.
Wiggum is an electrokinetic-dominant psyker. These powers are suppressed when Wiggum was fitted with a psychic nullifier.
Interactions with the player character
Wiggum only appears in Fallout.