Iyashi Kangoshi holds the position of eldest daughter in the Kangoshi family, serving as granddaughter to Sukizō Kangoshi and elder sister to Asuna and Himeru. Her family name merges the Japanese words for "government, bureaucrat" and "surpass, cross over."

She possesses waist-length dark purple hair, styled with strands falling on either side of her face, and distinctive purple eyes. Rosy cheeks and an unspecified birthmark or mole further characterize her appearance. Iyashi consistently wears a nurse uniform designed for the clinic where she works.

Exuding a mature and feminine personality, she works as a nurse alongside her sisters at a mental clinic. A notable reaction occurs when encountering an underaged male stalker: she experiences a nosebleed, suggesting potential attraction to younger individuals.

Within the series, her narrative centers on fulfilling her nursing duties and engaging in familial interactions.