Hanon is the Mermaid Princess of the South Atlantic Ocean, and the keeper of the Aqua Pearl. She has three different forms (Mermaid Hanon, human form, and her singer form Aqua Pearl Voice), and two image songs (Ever Blue and Mizuiro no Senritsu). She is the second mermaid to appear in the first season and becomes best friends with Lucia. Hanon is part of the main trio with Lucia and Rina throughout the whole series, and is there during the main battles. In the first season, Hanon had a crush on the music teacher, Mitsuki Tarou ("Tarou-chan", as she called him).

Spoiler

In Pure, Mitsuki left for Germany, and Hanon ended up falling in love with a classmate, Shiroi Nagisa. Hanon and Nagisa are now a couple.