Sheshe is an antagonist in the Mermaid Melody series and Mimi's older sister. Together they're the Black Beauty Sisters. Sheshe is the most evil from the two and she cares a lot about her little sister.

As the mermaid princess of the North Pacific (one of the seven mermaid kingdoms), Lucia entrusts a magical pearl to a boy who falls overboard a ship one night. Lucia must travel to the human world to reclaim her pearl and protect the mermaid kingdoms. Using the power of music Lucia is able to protect herself and the mermaid kingdoms from a growing evil force.

A Seiyuu/Singer who's best known for Sister Sheshe from Mermaid Melody.

After the final battle against Gaito, Sara had given her life to remain with him. The sea world is now at peace, but only with six mermaid princesses. 
While Caren, Noel, and Coco have returned to their kingdoms, it should be time for Lucia, Hanon, and Rina to do the same. After all, Mitsuki Tarou is leaving for Germany, and Doumoto Kaito is heading to Hawaii. Lucia is devestated, and when things couldn't get any worse, Kaito is lost at sea! Worst of all, a strange angel named Michel has appeared, wanting the mermaids to join him. But on the lighter side, Sara's spirit tells Lucia of Sara's successor, a young mermaid named Seira. The mermaids are in for another adventure!

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A Portuguese actress and voice actress. She likes to go to the beach, listen to music, online gaming, painting, reading, travelling, also she is an illustrator and a concept artist of comics, and she often does manga drawings. She did theater, and soon started to give voice to characters through the studio "Valentim de Carvalho" in 1999.

Lucia is the new girl at school. She and her sister run a public bath that's all the rage. When Lucia meets a terrific-looking surfer boy, there's just one little problem: Lucia is a mermaid-not just any mermaid, but a princess on an important mission to save the seven seas from an evil force bent on taking control of the marine world. Such a responsibility doesn't leave much time for romance. But Lucia vows to protect her world and win the heart of handsome Kaito. 
(Source: Del Rey) 
Note: Includes the one-shots Moonlight Goddess Diana (MOONLIGHT GODDESS ディアナ), Nude ni Natte (ヌードになって, Get Nude) and Cherry Blossom (チェリー ブロッサム), contained within Volume 7 of the manga.