Physically, she has long, straightened dark brown hair styled similarly to a hime cut, fair skin, and downward-curving green eyes. While working, she typically wears a dark green kimono with vertical stripes covered by a long white frilly apron. A distinctive flower ornament with a ribbon adorns the side of her head. She demonstrates an uncanny ability to avoid objects thrown near her, though she tires easily during strenuous physical activities.

Her background includes a familial legacy tied to Ama Usa An; her grandmother historically maintained a business rivalry with the founder of Rabbit House, though Chiya herself does not actively continue this competition. She shares a long-standing friendship with Syaro Kirima, having grown up next door to each other. She expresses a desire to work alongside Syaro in the future despite past disagreements about career paths.

Within the narrative of "Sing For You", she organizes a karaoke event at Ama Usa An to help Chino Kafū overcome nervousness about performing a solo in a school concert. During this event, she performs enka and participates in the lively singing session. This session temporarily escalates into a good-natured dispute among the girls about which café group Chino should represent, highlighting Chiya's role in facilitating group interactions and supporting her friends' endeavors.

Across other series media, her actions remain consistent: she engages in seasonal traditions, such as sharing a homemade Galette des Rois during New Year celebrations, and continues to mediate group dynamics. Her development emphasizes stability rather than transformation, maintaining her core identity as a kind yet playfully mischievous individual dedicated to her friends, family business, and personal quirks.