Touin, Rina

洞院リナ

Rina is the Mermaid Princess of the North Atlantic Ocean and the keeper of the Green Pearl. She is the third Mermaid to appear in the series. As part of the main trio alongside Lucia and Hanon, she is present throughout the series. Initially, she is depicted as beautiful but stern, driven by a desire for revenge for the capture of her best friend, Noel. Later, however, she evolves into a more mature character and acts as an older sister figure to Lucia and Hanon. She seems to love plasma TVs, a fondness she displays in many anime episodes. She also seems to love watching comedy shows.
When her kingdom was attacked by Gaito, Rina escaped with another Mermaid Princess, Noel. The two were searching for the other Mermaids when Gaito and Yuuri appeared. Their attack was intended to hit both, but Noel took the blows to save Rina. Since then, Rina went to the human world to avenge Noel by finding Gaito. Rina then transferred to the same school Lucia and Hanon attended, though she chose to wear the male school uniform. At first, she seemed to hate Kaito because he looked just like Gaito, although she did not know that. She was discovered by Lucia and Hanon, and the three subsequently became friends.

Spoiler

Rina has three different forms: Mermaid Rina, Touin Rina (her human form), and her idol form, Green Pearl Voice. Her two image songs are Star Jewel and Piece of Love.