Attina is the eldest daughter of King Triton and Queen Athena. She has an orange tail and wears an orange seashell bra. Her light brown hair is worn piled on top of her head in two rolls, and she wears an orange five-pointed tiara similar to the golden one Triton wears. In some coloring pages, she sometimes wears hoop earrings on her ears.
In original extension media released from 1989 onward as well as briefly implied in the original film itself, Attina is portrayed as the eldest of her sisters. In the 2008 film The Little Mermaid: Ariel's Beginning, however, she is portrayed eldest of all her sisters and is next-in-line to inherit the Atlantican throne. In her 2008 portrayal, her age causes her to feel a certain sense of responsibility for her sisters. She is described by her sisters in that film as being bossy, but ironically, she herself is often bossed around when her siblings outvote her. In the books, she is a bookworm and has a pet catfish named Fin Fin.
Attina plays only a minor role in the first film. Along with her sisters, she performs in the concert that Sebastian is putting on. Like everyone else, she is shocked when Ariel is nowhere to be found. Afterward, she is seen alongside her other sisters. At the end of the movie, she attends Ariel and Prince Eric's wedding along with her family.
As in the films, Attina makes only minor appearances, usually in the company of her other sisters. In the episode "Trident True", she is the victim of a prank played by Urchin. He replaces the sponge she uses for her powder, with a living one. When she goes to powder her face, it ends up turning it white and she looks at the mirror screaming. In "Land of the Dinosaurs", she tries to warn Ariel about their father's trident when she tells her other sisters about Flounder being frozen in an ice cube, but despite her warning, Ariel snatches the trident from her hands in time to save him.
Attina makes a small cameo appearance at the beginning of the film. She attends the christening of her niece, Melody, and is seen in a group shot with her other sisters.
Attina's largest role came in the film The Little Mermaid: Ariel's Beginning. She is shown as a child, and is introduced as one of the seven daughters of King Triton and Queen Athena. After the latter is killed, Triton bans music from the kingdom, hires Marina Del Rey to be governess to the girls, and puts them on a strict schedule. When Attina and her sisters discover that Ariel has been sneaking off to a forbidden music club, they join her the next night. However, Triton finds them, and punishes Attina and the others by confining them to his palace, thanks to Marina. However, Ariel is able to help her father remember how good music is, and everyone rejoices over the return of music. Triton restores music to the kingdom after his guards arrest Marina.
- Her name is an homage to a play that Alan Menken worked on prior to the movie.
- Her eyes were blue in the first movie like the rest of her sisters.
- Her tiara, which is similar to her father's crown, may have been a representation of her being Triton's heir.
- In a Disney Princess Magazine there is a comic called "Underwater Wedding" in which Ursula and her eels try to ruin her wedding and she is referred to as the eldest.
- Since Attina married a prince from another kingdom, she probably become queen of that kingdom, and renounce her claim. Assuming her other sisters do the same, Melody might end up becoming Queen of Atlantica.