Chie is a young human child, approximately four years old, with light-brown hair and large dark brown eyes. She typically wears a light-pink dress featuring a distinctive bulky white collar.

Energetic and playful, she often seeks attention by stealing and hiding patrons' belongings, like Rikuo's glasses, to initiate play. She frequently declares herself to be a cat. Her interests include shiny objects and ice cream.

Shimei, an elderly-appearing android prototype designed for parental care, is her foster parent. He treats her with deep tenderness, akin to a biological parent. Chie remains unaware Shimei is an android; he deliberately conceals this nature and only acknowledges his identity when she cannot overhear. His monthly absences for mandatory maintenance cause Chie significant distress, which she interprets as unexplained abandonment due to her lack of understanding.

As a regular patron at a café known for its non-discrimination policy, Chie interacts with other characters there. Her story illustrates themes of familial bonds between humans and androids through her innocent dependence on Shimei and her unfiltered acceptance of him, contrasting with societal prejudices. Her circumstances show no significant documented change, consistently highlighting the emotional reciprocity in her relationship with Shimei within the series' exploration of artificial intelligence and human connection.