|Residence||Tokyo, Japan; Gabu Jougasaki Apartments|
|Height||16cm (6 Inch. Approx.)|
Kotoko originally belonged to Yoshiyuki, but following Chi's kidnapping, Hideki and Shinbo forced Kojima to transfer Kotoko and her registration to Hideki so that her memories of Yoshiyuki kidnapping Chi cannot be erased.
Kotoko is far more serious than Sumomo, and thinks that everyone in the Motosuwa household is crazy, with Sumomo in particular. Kotoko's specialty is research, which twice drives the story forward. Kotoko is also programmed to always tell the truth, no matter what, even when it works to her owner's disadvantage. She is serious and often cynical, except when researching something, to the point of being tsundere or cold.
Kotoko has long dark hair tied in two pony tails with two large-bells. She wears a white kimono with a large red obi-bow in the front.
She has fair skin and deep-purple eyes. She also as a bob-like hair style with blunt-bangs.