Mabel Henderson's Mr. Handy

Mabel Henderson's Mr. Handy robot stays inside her house on Tranquility Lane and is controlled by a terminal in her kitchen. The robot can be made to kill her (and the vault dweller) by editing it's security settings on this terminal. It is otherwise a stationary NPC with no other functions in-game. He only has one line of text. (Which can be seen in the screenshot).

Related quests

 * Tranquility Lane