Yuzuki
Yuzuki (柚姫?) is a custom-built persocom created by Minoru Kokubunji roughly two years before the start of the series. She is very tall with long braids and blue hair. Her main outfit is a maid's uniform and at times outdoor civilian clothing. Yuzuki was created to resemble, physically and mentally, Minoru's late sister, Kaede, who had died from an illness two years earlier and has given her self-teaching software, meaning that she can learn things on her own instead of having to have programs loaded into her as is the case with most persocoms. 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 behaviors. However, Minoru still realizes that no matter how realistic she may be, she is still only a persocom that is following her programming. Yuzuki also possesses an awareness of her own limitations.
Yuzuki is shown to have good interaction with other persocoms around her. She is very sweet to Chi when they first met and even helps her learn along the way. To Yuzuki's surprise, Chi even helps her discover her true feelings for Minoru and thanks her for it.
It is shown in the manga that Yuzuki can also be very insecure. She always worries that she is not perfect enough for Minoru, just like how Yumi feels she cannot compare to a persocom.
Toward the end of the anime and manga, 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 reenter this data, because he has grown to love Yuzuki for who she is; because she is Yuzuki, rather than because she is a replacement for his sister. Voiced by: Fumiko Orikasa (Japanese), Karen Strassman (English)
Read more about this topic: List Of Chobits Characters