An agent of the Railroad, Caretaker appears at whichever settlement becomes the Mercer Safehouse. He is very jumpy and appears to have PTSD from the Switchboard incident when the Institute laid siege to the Railroad's former headquarters. Desdemona expresses hope that running Mercer Safehouse along with the Sole Survivor will help him get back on track after the incident.[1][2]
He does not count as a settler and cannot be assigned to tasks.
He will not become hostile if the player character turns hostile to the Railroad.
If the Railroad is destroyed, he will vanish from Mercer Safehouse and can later be found in a random encounter, where he is about to be executed by a raider.
PCPlaystation 4Xbox One Though he is assigned to Mercer Safehouse, he can wander to other settlements and remain there permanently.[verified]
References
↑Desdemona: "Caretaker used to work HQ. After Switchboard... Well, I'm hoping running your safehouse will be good for both of you." (Desdemona's dialogue)
↑Caretaker: "You weren't there. At the Switchboard. One day the Institute's gonna kill us all, I tell ya." (Caretaker's dialogue)