Iczer-3 is the heroine of the series. She is the third and final gynoid produced in the Iczer line by the Cthulhu, physically appearing to be ten years old, and is the younger sister of Iczer-1. After Iczer-1 is badly injured in a battle against Neos Gold, Iczer-3 is sent to Earth to defend against Neos' forces in her stead. Iczer-3's battle strength is equal to that of Iczer-1, but she lacks the experience and maturity to use that strength properly at first. This leads to her early battle tactics being rather childish and playful. She forms a close bond with Nagisa Kasumi, and develops a deep love for her.