The leader of the guards in Shady Sands, Seth is favored by Aradesh. He organized the guards to protect against raider and radscorpion attacks alike. He regularly went to the radscorpion cave to try and destroy their source, but he was unsuccessful.
Aradesh once attempted to set him up with Tandi, but she states that he is not her type. Seth, however, still seems to hold some kind of attraction toward Tandi, as when explaining to the Vault Dweller that she has been kidnapped, he refers to her as his "girl" before catching himself. After the founding of the New California Republic, Seth would found the New California Rangers.
During an expedition with Aradesh to look for Vault 13, Seth and Aradesh would disappear and were proclaimed dead.