Here’s a short creative piece developing that concept: The Bully of the Breton Tides
She didn’t drown him. Bullies don’t kill. They just want you to know they could . syren de mer bully
The harbor masters call her a nuisance. The elders call her a korrigan gone wrong . But the children — the brave, stupid ones — leave offerings: shiny bottle caps, lost earrings, once a whole bag of salted caramels. Not to appease her. To bribe her into leaving their fathers’ boats alone. Here’s a short creative piece developing that concept:
It sounds like you’re looking for a character or story piece based on the name I’ll interpret this as a mix of “siren of the sea” ( sirène de mer ) and “bully” — so a maritime mythical creature who uses intimidation or aggression, rather than just enchantment. The harbor masters call her a nuisance