Karasuba leads the doll staff at Kuroneko-tei cafe. Her body incorporates repaired components from damaged parts, restored to function by technician Tooma Nagi after he discovered her inoperative. She retains these original, aged pieces as a meaningful gift from Nagi, refusing all replacement offers.

She stands 155 cm tall with violet eyes and gradient blue-to-violet hair typically tied in a ponytail secured by a ribbon. Her signature attire merges traditional and maid-inspired elements: a furisode kimono minidress featuring yagasuri arrow patterns on the sleeves, knee-high boots, and a maid’s dress.

Her demeanor projects forcefulness and dominance, turning inflexible when confronting unforeseen circumstances. Though stern, she strives to model ideal behavior for Kuroneko-tei’s team, demonstrating care through conflict resolution and group stability. She dwells intensely on lapses in her composure, struggling to adapt.

Protecting Kuroneko-tei defines her core motivation and personal dream, driving meticulous oversight of cafe operations and safeguarding its community. She harbors a preference for extra-thick peanut butter shakes.

Amid escalating geopolitical friction, she accepted temporary duty as a maid doll on a resort island under Nagi’s supervision. This assignment coincided with intensifying military conflicts; its specific events and outcomes remain documented separately.