She is rich, rude and cranky. She was Eleanor Shellstrop's roommate when Eleanor was alive. She was victim to Eleanor and her other roommate, Brittany, in the "Dress bitch" business after an argument and lawsuit with the dry cleaners after Eleanor wore her new dress without permission and ripped it.
In the second timeline when Eleanor is trying to be good, Eleanor admits that she and Brittany were behind the "Dress bitch" shirts. Madison storms off in rage and moves out.
After her death, Madison's morality was tested until she was finally improved enough to enter The Good Place.
- In the Netflix subtitles, her name is seen to be mistaken as Val, a demon in The Bad Place.