Aunt Marge
Background
Aunt Marge is a bulldog breeder in England. Her brother is Uncle Vernon Dursley. Her sister in law is Aunt Petunia Dursley and her nephew Dudley Dursley.
During the events of Harry Potter and the Prisoner of Azkaban (2004) played by Pam Ferris
Harry Potter opens the door for Aunt Marge and Uncle Vernon. Aunt Marge walks in and hands her dog off to Aunt Petunia. Aunt Marge gets upset with the way Harry talks to her and calls him ungrateful. During dinner, Aunt Marge sees Harry staring at her and she asks him if the school he goes to canes him for misbehavior, she asks Aunt Petunia about Harry's parents and calls James Potter a drunk. Harry angrily denies it and the glass in Aunt Marge's hand shatters. Aunt Marge then says it wasn't James' fault for how Harry turned out and says "if there is something wrong with the bitch, then there's something wrong with the pup". Harry yells at her to shut up and suddenly Aunt Marge starts to expand to great proportions. She floats into the air and eventually floats out of the house.