Aquata is the fourth daughter of King Triton and Queen Athena. She has a coral blue tail and wears a matching seashell bikini top. She has brown eyes and brown hair that is worn in a ponytail tied up with a band of white pearls, but this is only in the prequel movie since in the main movie, the books and toys, all of the mermaid sisters have blue eyes. In the Broadway musical, she is portrayed by Kay Trinidad with green hair and a pink spiral shell bikini top. Her name means "watery" in Latin.
Aquata's personality is not well-defined until her appearance in books and comics following the movie. In the books, she is very good at dancing and has studied ballet. However in The Little Mermaid: Ariel's Beginning, it is stated that she danced like "a spastic piece of kelp". She also likes her favorite toy, Mr. Fuzzyfinkle, the pink plush seahorse with purple eyes. In the books, she considers herself ready to be Queen.
Aquata first appears in the "Daughters of Triton" sequence, where she is the first to be introduced. Afterward, she appears only in cameos alongside her sisters. Almost off-screen, she asks "What's with her lately?" as Ariel passes the vanities. At the end of the film, she is shown to attend Ariel and Prince Eric's wedding.
Aquata appears in some TV episodes, although her pearly hairband isn't drawn right. In the episode "Beached", she is preparing for the Carnival of Tides when putting on red seashell earrings. She feels a little tired as seen in the episode "Land Of The Dinosaurs".
Aquata appears in a cameo role, and is seen with her sisters at Melody's christening.
Aquata is shown as a child, and is introduced as one of the seven daughters of King Triton and Queen Athena. After her mother is killed, Triton bans music from the kingdom, hires Marina Del Rey to be governess to the girls, and puts the girls on a strict schedule. When they discover that Ariel has been sneaking off to a forbidden music club, they join her the next night. However, Triton finds out after being informed by Marina, and punishes them by confining them to their room. However, Ariel is able to help her father remember how good music is, and everyone rejoices over the return of music.
- In the subtitles for The Little Mermaid, as well as the vocals for "Daughters of Triton", her name was apparently spelled and pronounced "Aquanta".
- Her eyes were brown in the first movie unlike her other sisters.
- Her name means "watery" in Latin.