Mermaid Stained Glass
Brilliant Prefects' Bathroom
Prefects' Bathroom, Hogwarts Castle
This lavish depiction of a beautiful mermaid calls the Prefects' Bathroom home. When awake, she is known to show off cheerfully to any students that come and go from the bathroom. She is credited with inspiring both Harry Potter and Cedric Diggory to open their Golden Eggs under the water during the 1994 Triwizard Tournament, allowing them to hear the siren song properly.