Shinbo introduces Hideki to Minoru Kokubunji, a twelve year old genius who specializes in the field of custom made persocoms. Minoru’s persocoms, including Yuzuki, a fairly exceptional custom made persocom, are not able to analyze Chi either, and thus they conclude that she may be one of the Chobits, a legendary series of persocoms rumoured to have free will and emotions.
Although this could be a possibility, Minoru is confident that it is only a rumour. Yuzuki also adds that she does not resemble any persocom model in any available database …

A “chobit,” a technologically advanced persocom rumored to possess true machine intelligence, with the ability to feel emotions and act on her own will, unlike other persocoms. Now, she is dressing in gothic suits.

Chii is a persocom or personal computer with a human body. She was found in a dump site by a boy named Motosuwa Hideki. He is delighted to have found a perfectly good and very cute persocom (which is usually more than Hideki can afford) for free.