"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."

"Hanon is a kind and friendly mermaid, but acts much more different when it comes to boys. At first, she thought it was wrong to love humans, but after falling in love with Taro Mitsuki, she changed her mind. Hanon is a love expert when it comes to boys and is obsessed with fashion and make-up. She also loves to go shopping for clothes and lots of stuff."

"Yuri is one of the antagonists in the anime Mermaid Melody. Yuri has a childish personality. Although Yuri is loyal to Gaito, his continued treatment of her as a child leads her to a star-crossed relationship with Hippo, when in his human form."