She is found by Hideki one night in a pile of trash as he makes his way home from work. Upon turning her on, she is only able to say the word "chi," remembers nothing of her past life, and is unable to perform even simple tasks. Because of this, Hideki names her Chii and undertakes teaching her how to function. Because her system cannot be scanned by other persocoms, Minoru Kokubunji suggests she may be one of the legendary chobits. Minoru tells Hideki that Chii needs software to perform common persocom functions such as email, but that he doesn't know which ones and to wait for Chi to tell you herself. Through the course of the series, Chii learns basic skills, and eventually takes a job to help support Hideki.
While other persocoms are seen performing various computer functions, Chii is seen to do it only once, when she traces Yumi's location through Yumi's PDA.
About the past of ChiiAs Chii and Hideki learn more about her, Chii begins to have visions of another persocom who is identical to herself. Hideki (and the audience of the story) eventually learns that this is Freya, her twin, and that Chi was originally called Elda; after Freya fell in love and broke her heart, her memories were downloaded into Chi, before her system stopped. While Ms. Hibiya was telling Hideki about Chi's earlier life Freya was telling a simpler, less detailed, version of the same story to Chii. The fewer details mean, among other things, that Chii is still unaware at the end of the story that Ms. Hibiya was formerly her mother.
Midway through the story her full name, Chii Motosuwa, can be seen on her pay envelope.
СompletionDuring the series, Chii reads a series of children's picture books, "A City with No People", about a character searching for the "person just for me," which were written pseudonymous by Chitose Hibiya as a way of reconnecting Chi to her past self as Elda, and to guide Chi's search for love. At the end of the series, Hideki finally admits that he loves Chi, and is her special person.
Voiced by: Rie Tanaka (Japanese), Michelle Ruff (English)