Materia is a character from the anime series Frame Arms Girl. She is a humanoid robot, or Frame Arms Girl, that has been brought to life from a model kit. Known for her calm and composed demeanor, Materia exhibits a distinct lack of emotions which gives her an enigmatic presence. In the series, she serves as both a mentor and a competitor to the protagonist, Ao. Despite her stoic exterior, Materia demonstrates a sense of camaraderie and loyalty, often providing guidance and support to her fellow Frame Arms Girls during their battles and interactions.