Magami, Eiko

A-ko appears to possess near-invulnerability alongside superhuman speed and strength. As the series' heroine, she resides in Graviton City, Japan. Typically, A-ko is friendly, cheerful, and polite, consistently striving to maintain a normal life despite her unusual lineage. Nevertheless, she harbors a fiery temper and becomes highly dangerous when angered. She has a large appetite and a tendency to oversleep on school days. Her constant companion is C-ko Kotobuki, whom she has known since kindergarten. Although she genuinely loves C-ko, she can become frustrated by her friend's relentless immaturity.
A-ko's powers are restrained by the distinctive armbands she always wears. Without them, her strength becomes uncontrollable, causing her to destroy nearly anything she touches (and even objects she does not touch).
It is hinted that her parents are Clark Kent and Diana Prince (Superman and Wonder Woman).