Melody: Daughter of Ariel and Eric. Granddaughter of King Triton. Turns between Human and Mermaid with her magic locket.
Max the dog: The royal family pet dog. Turns between Dog and Dogfish from Melody's magic locket.
Sebastian the crab: Sebastian is Melody's good friend and Guardian. Like from Ariel, Sebastian must make sure Melody stays out of trouble lots of times.
Tip and Dash: Tip and Dash are Melody's best friends. They always go along with Melody on her advantures.
Scutte the seagull: Scuttle always must keep an eye out for Melody. like from Ariel, Scuttle always helps her all the time.
Ariel: Mother of Melody and wife of Eric. Ariel is very protective of Melody and knows she may get herself in to trouble.
Prince Eric: Father of Melody and husband of Ariel. Eric knows that Melody is a lot like her mother and knows what to set her mind to.
King Triton: Grandfather of Melody and father of Ariel and her sisters. He put a little magic on Melody's locket so she can change into a mermaid and visit Atlantica when ever she wants.
Flounder: Best friend of Ariel. Flounder's loyalty to Ariel is very strong and will report to her when Melody is in trouble.
Ariel's sisters: Aunts of Melody who love to see her visit Atlanitica and knows when she is in to merboys.
Undertow: A big toothless tiger sharks who lost all of his teeth from the battle. He plans to steal the king's magic trident to he can free his misters Morgana from her icy imprisonment.