A Carribean Crab, Sebastian is brought to be the court composer and tutor to Ariel.When not working, he follows Ariel around, trying to keep her out of trouble. He follows Ariel onto the land when she goes in search of Eric, and lends his voice to the beautiful love scene when he and the animals of a lake sing "Kiss the girl".
Sebastian the crab is King Triton's advisor, and Ariel's friend / guardian / nagging protector. He tries to get Ariel to forget the land above the ocean surface, and may not approve of some of the things she does, but as a friend, he's willing to help her get her dream.
"Why don't you get your head out of clouds and back in the water where it belongs?"
King Triton's royal adviser, guardian of the young mermaid Princess Ariel, and music maestro. Aside from being the royal music instructor to King Triton's seven daughters, Sebastian also serves as the Scout-Master for the Atlantican Troop of Sea Explorers called Crabscouts (Tuffy, Clawdia and Buster). In his younger days, Sebastian left his home and family in Jamaica to travel the seven seas, during which he learned much about life in and out of the water. He eventually migrated to the undersea Kingdom of Atlantica where he became the court composer and tutor to the young daughters of King Triton (especially of the head-strong Ariel). Being loyal to the throne Sebastian is an advocate to King Triton's rules against contact with the surface world and humans.
Because of his personal knowledge of humans and his trusted position as King Triton's advisor and friend, the King appointed Sebastian to the task of overseeing Ariel's affairs and reporting to him concerning her rebellious ways, especially any contact with humans and human artifacts. Sebastian reluctantly agreed to this duty, not only because of his friendship with the king, but his fatherly affection and concern for Ariel as well. Sebastian, along with Urchin the merboy and Flounder, are Ariel's constant companions. Sebastian has also served as host for Disney's short-lived cartoon showcase called "Raw Toonage," and starred in his own series of animated (and comic book) shorts in a series called "Sebastian," as well as being a co-star in the film "The Little Mermaid" and a regular in the TV series "Disney's The Little Mermaid."