Mao Amatsuka embodies the role of both a high school club president and the eldest sibling in the Amatsuka family. Her wavy ginger hair shifts subtly with her emotions, framing bright orange eyes and a mischievous fang. Standing at 138 cm, her petite stature and a signature pair of black thigh-high socks with her uniform often cause others to assume she’s a younger student.

Fiery and impulsive, Mao balances her boldness with flashes of shyness, channeling restless energy into playful aggression—often nipping the club’s sole male member when bored—a tsundere streak underscoring her aversion to overt affection. She recoils from romantic gestures, skipping media with kissing scenes and stiffening at even cheek kisses. Her passion for shounen manga and light novels fuels shared reading sessions with the same male classmate she teases.

Family dynamics highlight contrasts: her younger sister Megumi towers over her with a calm, nurturing demeanor, while Seira’s overprotectiveness sharpens Mao’s insecurities about her height and perceived immaturity. As club leader, she crafts inventive activities like cosplay or group outings, blending authority with a playful spirit.

Quirks include secretly favoring children’s menus despite blushing at the choice, shuddering at spiders or horror themes, and clinging to a belief in Santa Claus—her wide-eyed trust preserved by others’ reluctance to shatter the illusion. Though competitive in games, she prioritizes camaraderie, hastily smoothing tensions sparked by her own impulsiveness.

No documented developments expand her traits beyond these core interactions.