Amuru is a human with blonde hair and brown eyes, originating from a town where she serves at a church, her background linked to an ancestor named Shivamaria. When the church comes under attack, she deliberately diverts Akuma forces away from it, resulting in her being surrounded until Phoenix intervenes and rescues her. This event leads her to join Phoenix and Asuka on their journey. She possesses innate healing abilities, which she employs to aid wounded individuals during wartime conflicts. Her role evolves when she later acquires a Cyber Up transformation during a pivotal moonlit event, becoming known as Gekkousei Amazo Amuru. This form enables her to confront a demonic version of herself, sparking internal conflict. In combat, she wields weapons such as the Satan Sword and the Saint Sword, utilizing techniques like Magekka, Youko Seimazan, and Youko Seimadan. Her character development shifts her from a supportive healer to an active combatant through her Cyber Up form.