Which perpetually depressed character haunts one of the Hogwarts girls' bathrooms?

Answer Moaning Myrtle

In life, Moaning Myrtle was a Ravenclaw student who was frequently picked on. She met her end in the girls' bathroom when she was murdered by the basilisk — the same basilisk that was imprisoned in the Chamber of Secrets. One of several ghosts that call Hogwarts home, Moaning Myrtle devotes most of her time to wailing and splashing water about.

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