Coco (ココ Koko) is one of the main supporting characters in the anime Mermaid Melody. Coco is the princess of the South Pacific Ocean. Using her Yellow Pearl, she can transform into Yellow Pearl Voice and help fight against evil.
Coco is the first princess to be trapped in Gaito's castle. In the manga, Coco followed Sara to Gaito's castle because she was worried about Sara's change of heart. When seeing her growing close to Gaito, Sara threatens to destroy Coco's kingdom if she does not allow Gaito to capture her. Coco is a loyal friend and thanks to Coco's feelings of love, Sara was put back on the path to her true self. She seems outspoken and brash at times, more so in the anime. In the second season, Coco is finally free and enters the human world. There, the mermaid princesses learns that she is unexpectedly a flirt around guys. Also, Coco acts like a cupid as shown in episode 17 when she tries to get Hanon and Nagisa together after she overheard Rina and Lucia talk about Hanon treating Nagisa badly. She get Noel and Karen to help with her plan. Her first plan was call "Have Nagisa Profess His Love by the Sea! Operation Attractive!" by having Nagisa breaking a watermelon while being blindfolded, and having him ride a banana boat at top speed. Her second plan was called "Confession of Love to Nagisa by the Sea! Operation Jealousy!" by having Noel attaching herself to Nagisa to make Hanon jealous. However the plans to Lucia and Rina make them believe that Coco and the others are doing this the wrong way.
Coco is a bright, loving and caring girl. She normally worries for her friends, especially Sara, and can keep their secrets very well. She is also a fun-loving mermaid and often goes around flirting with boys on the beach. The manga version is much more gentle than her anime counterpart, who is more brash and outspoken. Coco is loyal to her friends, perhaps even loyal to a fault. As seen in episode 12 of Pure, she lied to Lucia, Hanon, and Rina to help her find Sara's shell without telling the secret at first. It also seem to appear that Coco is bad at acting as seen in episode 20, for she did not fool Hanon in trying to convince her that everything is fine.