Yuh

Obviously 🙄
Jk
Just steal Disney's mermaid concept and
BOOM💥
You will have a good story

A mermaid whose only goal was to fly amongst the clouds, but cursed to the bottom of the sea with but a mirror and a glass ball, showing the sky at the time. She then bargains with an anglerfish to unbound her from her cage at the bottom of the sea. I can’t think of anything else rn

Ah yes my teacher would love that story

One day she found a plastic bag attempted to eat it and died
Moral of the story:
Don't throw trash to the ocean