Goes by Addie. She is open and inquisitive, but does not have a good sense of boundaries. She has a habit of sneaking into the house and startling Vivien and Ben Harmon. She warns Vivien about her dangerous new house, as she has warned past inhabitants, who generally do not listen. Emotionally abused by her mother Constance, who has taught her to believe she is unattractive and does not belong in public. Her mother sometimes locks her in the bad girl room, a closet with mirrors, which scares her. She is friends with the ghosts in the Murder House.Background: Has Down syndrome. Daughter of Constance and Hugo Langdon, sister of Tate, Beauregard and another unnamed sibling. Coyly claims not to be a virgin and there is some reason to believe she had a sexual encounter with Travis, her mother's boy toy.