Kasumigaoka Utaha is rendered as a poised and alluring bunny figure, embodying her refined persona from Saenai Heroine no Sodatekata. She wears a sleek black bunny suit with subtle glossy finish, contrasting white cuffs and a delicate white collar, and a fluffy white tail at the back. Long, ebony hair cascades down her shoulders in glossy strands, with a precise fringe that frames a composed face and alert purple eyes. Her ears rise gracefully, adding a playful contrast to her elegant pose. The pose suggests intellect and confidence, with one hand lightly lifted and the other resting near her hip, creating a dynamic balance on a stylish pedestal with the series emblem.

Kasumigaoka Utaha is introduced in Saenai Heroine no Sodatekata as a genius novelist renowned for her sharp wit and effortless charisma. She forms an unlikely alliance with Tomoya Aki as they collaborate on his game project, offering worldbuilding, dialogue, and character depth that only a seasoned author can provide. Beneath her elegant exterior lies a careful, sometimes guarded personality shaped by fame and high expectations. Her interactions with Tomoya spark teasing banter and tender moments, revealing a growing trust and unspoken affection. Throughout the series, Utaha's past works, ambition, and creative drive drive the plot forward, challenging rivals, shaping the heroine routes, and guiding the ensemble toward a memorable, heartfelt ending.