“Watashi” (a first person pronoun in Japanese), a character drawn by Chitose Hibiya in a children’s picture book A City with No People, is used in the series to hint at the definition of reciprocated love to Chi, and is used to highlight issues with human-persocom relationships; drawing upon the fact that because persocoms can be programmed to imitate desirable human behavior, humans would opt-out of human relationships, resulting in obvious problems, such as the inability to further produce offspring.

The opening theme of Chobits is “Let Me Be With You” by Round Table featuring Nino. The ending themes are “Raison d’être” (Reason to Be) by Rie Tanaka (episodes 1–13), “Ningyo-hime” (Doll Princess) by Rie Tanaka (episodes 14–25), and “Katakoto no Koi” (Awkward Love) by Rie Tanaka and Tomokazu Sugita (episodes 26).

Chi 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 pseudonymously by Chitose Hibiya as a way of reconnecting Chi to her past self as Elda, and to spark her own search for love. At the end of the series, Hideki finally admits that he loves Chi, and is her special person.

As the series progresses, Chi begins to have visions of another persocom who is identical to herself, and eventually learns this is Freya, her twin, and that Chi was originally called Elda; after Freya fell in love with her father and creator and had her heart broken (she couldn’t muster the courage to admit her feelings in the anime), her memories were downloaded into Chi, before her system was wiped at her own request.