The informant is marked IN.
IN: There’s this one spirit, called the green lady, who wanders around this botanical garden, that I think has water or like some kind of pond in it. She has green scales and jagged teeth, very Shape of Water, and her hair is made up of seaweed, and so the story goes that she had visited that garden with her children and one of them got lost and drowned in the lake. Because of that, she died with a broken heart and is apparently supposed to roam that area, in search of her child. And anyone visiting this garden is told not to leave their kids alone, because the spirit will like, take them as revenge or a consolation to her own child, you know.
Context: I asked the informant at work if he had any Hawaiian folklore tales he could remember.
Background: The informant is Hawaiian, with Japanese-American family. He heard this story around from locals in the area around this botanical garden.
Analysis: I think that this story is very similar to La Llorona in nature. It also functions as a story to tell children to get them to stay with you while visiting this area, as it will scare them to be alone with a fish-like spirit with jagged teeth.