Chie is a young, energetic regular customer at the Time of Eve café. She is a female child with brown eyes and brown hair that reaches her neck, typically seen wearing a light pink dress. Her exact age is not specified in the series, though estimates generally place her around four to eight years old. She is the foster child of Shimei, an elderly robot, and the two are almost always seen together, with Shimei treating her with great tenderness as if she were his own child.

Chie has a very upbeat and cheerful personality, often described as mischievous and playful. She is a curious and adventurous girl who is always moving around the café, running about and reaching out to grab anything that catches her interest. One of her most notable traits is her habit of pretending to be a cat, a claim she makes throughout the entire series. Her playful nature sometimes manifests as stealing small items from the other customers, such as when she takes Rikuo's glasses, and she has a particular fondness for hiding things, as well as a love for shiny objects and ice cream.

Within the story, Chie serves as a regular patron who adds to the unique atmosphere of the café, where the rule is that humans and robots are to be treated equally. Her primary role is tied to her relationship with Shimei. Though she is unaware of it, both she and Shimei are robots, a fact she does not understand due to her young age and childlike perception. The depth of her emotional attachment becomes apparent when Shimei leaves for repairs; she becomes extremely distraught by his absence, demonstrating that the bond between them is as strong and genuine as any human family relationship.

Chie does not possess any notable special abilities beyond the normal physical capabilities of a child her age. Her significance in the narrative comes from her innocent and uninhibited behavior, which highlights the central theme of the series about the blurred line between humans and machines. Her genuine emotions, playful interactions, and deep bond with her foster father serve as a natural and poignant example of how robots in this world can possess the same feelings and familial connections as humans, reinforcing the café's core principle of treating all patrons with equal respect and dignity.