Rina Toin

Rina Toin is a main protagonist alongside Lucia and Hanon in Mermaid Melody. She's the Mermaid Princess of the North Atlantic Ocean and keeper of the green pearl.

Description
Rina is the Mermaid Princess of the North Atlantic Ocean. She couldn't let go of her past when her kingdom was attacked and destroyed by Gaito. While swimming away, she ran into her best friend, Noel, whose kingdom had also been destroyed. For a while, they traveled together, until Gaito and Yuri caught up with them. They were both about to be captured by Gaito and Yuri until Noel pushed Rina out of the way and told her to get away and find help, allowing her to escape. Because of this, Rina felt guilty for leaving Noel to be captured. Upon learning that Noel had been captured, the mermaids of the Antarctic Ocean, including their princess Caren, incorrectly believed that Rina had abandoned Noel to get to safety. This narrative is proven false when Caren is rescued from the clutches of the Black Beauty Sisters, and so the animosity between them comes to an end.

In Episode 28, Rina is almost tricked by the Black Beauty sisters, who were disguised as Caren and Noel, to join Gaito and be captured; however, with the help of Aqua Regina, she soon breaks out of it. After rescuing the real Princesses, her and Noel reunite.