The Overseer (Vault 101)

Alphonse Almodovar (2225-2277) is the Overseer of Vault 101 and the father of your childhood friend, Amata. He and his wife rarely spoke to one another. His wife died in 2260 from unknown causes.

Raised by a very conservative family which opposed the good neighbor policies of his predecessor, Alphonse grew to believe that this policy presented a threat to the Vault society. When the former Overseer vanished without a trace on one of his treks to the Capital Wasteland in the mid-2250's, Alphonse used his considerable charms and strong will to muscle his way into the position of Overseer.

As Overseer, he is determined to keep the Vault closed to the outside world, at least for the general population of Vault 101. When James escapes, he thinks that the Vault 101 Dweller had something to do with it, so he sends his security after him/her. He orders the death of Jonas after James' escape and interrogates his own daughter during the Vault 101 Dweller's escape. Depending on whether or not you kill him, Amata will react differently toward you.

If you do not kill him during your escape, he will tighten his grip on the citizens of Vault 101, which will result in a rebellion. Later in the game, if the player character travels near the Vault, their Pip-Boy 3000 will discover the Vault 101 Emergency channel where Amata was broadcasting a plea for help on a repeating loop, which reveals to you factional crisis in Vault 101.(Only available once you complete the "Waters of Life" quest.) However if you kill The Overseer, Officer Mack will take over and behave exactly the same way only difference being the Overseer.

When you converse with the Overseer, he reveals his fear of the Vault being contaminated with the outside world (due to his Vault's stated mission), and does not want to allow the youthful "rebels" from repeating the same mistakes the peers of his generation did when they left the Vault, only to never return. If you check his console, it is revealed that after you left, the Enclave contacted the Vault in an attempt to gain access, but the Overseer denied them entry as he would not trust the lives of the Vault inhabitants to outsiders.

He also regretted his actions during the night of you and your father's escape.

IDs
Like most inhabitants of Vault 101, the Overseer has multiple Base and Reference IDs during various quests:

Appearances
Just like Vault 101, the Overseer appears only in Fallout 3.