Ariel

Ariel, or the Little Mermaid, is an antagonist in the Fantasy series. She is a dangerous Siren who uses her voice to lure unsuspecting sailors to their deaths so that she and her sisters can eat whoever is on board. While Captain Hook and Jim Hawkins were on their way to find the treasure, they were nearly done for when Ariel hypnotized everyone with her voice. They would've all died if Jim hadn't snapped out of it and saved the entire ship and crew.