- "Hi, my name is Marilyn. I have a lovely collection of beetle pincers!"
Marilyn was a witch and eccentric Hufflepuff student at Hogwarts during the 1990s. She collected beetle pincers in her spare time as a hobby. She had a younger brother named Arthur, who were both described by other students as "being a bit off", meaning others found them somewhat strange.
- Harry Potter and the Philosopher's Stone (video game) (First appearance)
- Harry Potter and the Chamber of Secrets (video game) (Mentioned only)