Chie Karita is the young daughter of Shuhei Karita, the owner of the Karuchie restaurant, from which her name is also derived. Despite being a child, she displays a level of responsibility and practicality that far exceeds her age, largely due to her father's absent-minded and somewhat scatterbrained nature. While many children her age might be preoccupied with play, Chie is often found managing the household and keeping the family business on track. She is a proficient cook, capable of handling kitchen duties at the restaurant, and frequently has to remind her father to complete his errands and other adult responsibilities.

Chie's personality is defined by this mature and no-nonsense attitude, which stands in stark contrast to the more whimsical or struggling characters around her, such as the main protagonist Mayuko Chigasaki. She is grounded and dependable, acting as the practical anchor for her otherwise distracted father. Her motivations are simple and rooted in maintaining the stability of her home and the Karuchie restaurant. She takes her role as the responsible party in the family seriously, ensuring that daily operations run smoothly.

Within the story, Chie serves as a supporting character, primarily associated with the Karuchie restaurant, a central location where Mayuko works. Her key relationship is with her father, Shuhei, where the typical parent-child dynamic is often reversed; she is the caretaker, and he is the one needing guidance. She also shares a significant, though friendly, rivalry with Mayuko Chigasaki. The two frequently play video games together, and Chie is notably skilled in this area, consistently defeating Mayuko every time they compete. This recurring dynamic highlights Chie's competence and provides a source of lighthearted frustration for the older but less skilled Mayuko.

Chie does not undergo a dramatic transformation or character arc throughout the series; her role is more consistent, providing a steady and reliable presence. Her primary development is expressed through her natural and already-established maturity as she continues to manage her family's affairs. Her notable abilities include her cooking skills, which are impressive for her age, and her talent for video games, where she holds an unbeatable record against her friend and coworker.