She is a light blue goth fish who wears a purple and black dress. She also wears a black bracelet with metal. She has light pink lips, short dark brown hair, and wears a fish bone necklace.
Role in episode
After Pearl gets a job at the Bikini Bottom Mall, Nocturna teases her and accuses her of being uncool, until Beatrice forces her and Pearl's ex-friends to listen to her stories for an hour. After this, they reconcile with her.