TRANSFORMATIONThe following information may be of semi-spoilers if you have yet read the manga or watched the anime. All of the following information is based off of the manga version of Mermaid Melody Pichi Pichi Pitch unless stated otherwise. If you have not yet started this series, there may be spoilers. Please be aware.
Being a mermaid princess, Hanon does not only have a human and mermaid form, but she has a pearl voice form. All of these forms make up the different stages that Hanon has. Hanon's forms are as followed: Mermaid Hanon, which is her basic true shaped form. You see this for the first time in chapter 02 of the manga. The next important form of Hanon is when she is in mermaid princess form. Each princess has a formal princess dress, which can be seen in chapter 14 of the manga. After that is Hanon's human form, where she loses her fins and tail and gets human legs and a human body. You first see Hanon in her human form in chapter 01 of the manga. When it's time to defend herself or fight, Hanon transforms into Aquamarine Pearl Voice - Hanon's super heroine alter-ego. You see this alter-ego in chapter 02. If being in this form is not enough, Hanon has the ability to have an Aquamarine Pearl Voice power-up outfit, its a new outfit that gives her more strength. You see this in chapter 14 of the manga after she powers up for a battle.