|Relations||Minoru Kokubunji (Owner/Creator)|
|Residence||Tokyo, Japan; Kokubunji Residency|
|Height||160cm (5'2"ft Approx.)|
|Volume 1, Chapter 5|
|Episode 2: Chi Goes Out|
Yuzuki was created to resemble, physically and mentally, Minoru's late sister, Kaede, who had died from an unspecified illness two years prior.
Yuzuki is programmed with all of the data that Minoru could remember about his sister; what she liked, what she disliked, as well as her habits and behaviours. However, Minoru still realizes that no matter how realistic she may be, she is still only a Persocom made to look like his sister; only following her programming. Yuzuki also possesses an awareness of her own limitations.
Toward the end of the anime and manga series, Yuzuki loses a large portion of Kaede's personality data as a result of trying to hack into Zima and being counter-hacked by Dita. However, Minoru declines to re-enter this data, because he has grown to love Yuzuki for who she is.