Carol (Fallout 3)

Carol is a pre-war ghoul and hotel proprietor residing in the Underworld. She is Gob's "mother", although Ghouls don't give birth. He is like a son to her. You can rent a room for 120 caps, and listen to a long story about her life. She was born in 2051 and so is more than 200 years old.

Carol survived in a shelter in DC after receiving a warning that the West Coast was destroyed. Her father was killed in the blast when he tried to help another family into the shelter after ensuring Carol had gotten into the shelter. She moved into the Underworld exhibit since it was the closest building that wasn't on fire, and remained there as more people came and she and they became ghouls.

The history of her life is very dramatic, but it provides a good account about how the war was and how the survivors suffered the radiation effects and the chaos.

If both Gob (in Megaton) and Greta (in Underworld) are killed, she will generally mope around in her shop.

Trivia
Carol is evidently a lesbian as she sleeps in the same bed with Greta, whom she tells you she was lucky enough to find after coming to Underworld and whom she calls "Darling" and such other names. Carol also mentions Greta used to feel a bit jealous of Gob, and when the character tells her about Gob's whereabouts, she begs to advise Gob about not leaving the place he is in; surely this has to do with Greta's Jealousy.