Attina (voiced by Kath Soucie) is the oldest princess of Atlantica, and the first daughter of King Triton and Queen Athena. She wears a crown similar to her father's, which shows her status as heir to the throne of Atlantica. She has the most respect for the rules, and often tells Ariel to leave things alone and not to push their father. Her hair is also much longer than it seems.
- Her name is a homage to a play that Alan Menken worked on prior to the movie.
- Attina is 21 years old.
- Her sisters say that she's responsible.
- Her pet peeve is mer-people that litter in the coral reef.
- Her favorite food is kelp wrap.
- Her favorite genre of music is classical.
- Her favorite instrument is the harp.
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