Oceanna is a 2021-introduced and all around-character. She is a student at Mermaid High, and a main character in the Animated Series. Her favorite food is Fin-n-Out, & her "Mer-Style" is Sporty chic.[1]She debuted in the Series 1 doll lineup.

Oceanna joined the Mermaid High surf team and now she and Catalina are co-captains.