Who is Marietta Edgecombe in Harry Potter?

Answer 1

Marietta Edgecombe is a witch who was a student of Hogwarts from 1990 to 1997. She was sorted into Ravenclaw house and was a good friend of Cho Chang.

In her sixth year, Marietta joined Dumbledore's Army at Cho's urging, despite being reluctant to get on Dolored Umbridge's bad side. When she became afraid that her mother's job at the Ministry of Magic might be threatened by her membership in the organisation, Marietta betrayed the D.A. to Umbridge. This activated a jinx that caused boils to erupt on Marietta's face, and a Memory Charm was later placed on her in order to prevent her from fully incriminating her fellow D.A. members.

Cho was upset for her friend and defended her to Harry Potter, calling Hermione's jinx a "horrible trick". Harry, however, considered Marietta a traitor and Hermione's jinx brilliant. After this row, their relationship fell apart.

Marietta still had blemishes on her face from the jinx the following school year, and took to wearing thick make-up to try to cover them up, with limited success. She sat with Cho on the train to Hogwarts for their final year; they saw Harry Potter on the way, but did not speak to him.