OVA
Description
Sixteen-year-old Graviton City high school student A-ko Magami possesses red hair and superhuman strength and speed. Magical black forearm bracers act as power limiters, regulating these abilities; without them, her uncontrollable strength causes accidental destruction. Even with the wristbands, her high-speed movements create a destructive aftertow capable of tearing pavement and structures. This power incontinence manifests in incidents like a public pool visit where removing the wristbands led to her becoming lodged headfirst in floor tiles after a dive.

Her background suggests extraordinary lineage, with parents visually resembling archetypal superheroes comparable to Superman and Wonder Woman, implying hybrid genetics as the source of her powers. She maintains a longstanding protective relationship with childhood friend C-ko Kotobuki, whom she consistently defends from threats including their classmate B-ko Daitokuji's obsessive pursuits. This dynamic forms a central interpersonal triangle. A-ko expresses conventional romantic interests in males, notably developing affection for the character Kei in later installments, though her romantic aspirations remain unrealized.

Her standard attire is a sailor-collared school uniform that transitions into her battle outfit: a white blouse, red scarf, blue skirt, knee-high socks, and Mary Jane shoes. Beyond physical prowess, she exhibits heightened senses, including auditory acuity sufficient to discern distant cries for help. Personality-wise, she strives for normalcy despite her abilities, displaying habitual tardiness, a substantial appetite, and an occasional fiery temper when provoked, often triggering destructive confrontations. Her daily life involves navigating school routines while managing collateral damage from conflicts, particularly with B-ko, necessitating specialized military containment units in Graviton City during their escalating battles.

In the alternative continuity of the "A-ko the Versus" OVAs, she appears aged 19 working alongside B-ko as bounty hunters on an extraterrestrial desert planet. This version lacks her primary universe's attachment to C-ko, instead regarding her as an irritant, and maintains a vitriolic partnership with B-ko. A later glimpse into her potential adulthood within the main continuity occurs in "Project A-ko 4: Final," showing her employed as a corporate secretary, though narrative focus shifts toward parallel universe iterations. Her cameo in the fourth film features an abrupt entrance during a wedding sequence while wearing her signature battle uniform.