Kurona Yasuhisa

Kurona Yasuhisa is an artificial one-eyed Ghoul and she and her twin sister, Nashiro Yasuhisa. She is a member of the Ghoul Restaurant and a bodyguard of Madam A after being abandoned by Kanou and seeing her sister killed in the midst of their merger. After the events of the series, she becomes an antihero in the Tokyo Ghoul series.

Background
Earlier in the past, Kurona and Nashiro were two normal human girls before the tragerdy. His parents were killed by a Ghoul who was soon arrested by CCG, while Kurona and Nashiro should have been trained to become Ghoul Investigators, one day they met Akihiro Kanou who manipulated them to join him, and Kurona and Nashiro then accepted, and Kanou turned them into and a one-eyed Ghoul, and they referred to him as their new father.

Raid on Kanou's lab
During the Kanou investigations, they are ordered by Kanou to protect Madam A from Kaneki's group, so they have a confrontation with Kaneki in which they turn out to be one-eyed Ghoul, which leaves Kaneki surprised. After they met Eto Yoshimura begins to mock the moans about his parents's deaths. She then has a confrontation with her former CCG colleague, Juuzo Suzuya where they face him but Juuzo almost kills them, and they are forced and back off with injured Kurona and impared Nashiro. Then Kurona stumbles upon Koutarou Amon who is surprised to see that she is a one-eyed Ghoul, then she runs away. Kurona later discovers that Kanou is a member of the Aogiri Tree and demands that she go with him, but she refuses, and with that Kanou then leaves the twins behind.

Personality
Since her parents's deaths, Kurona has become a very reserved girl, being cold, niihistic, she has also totally given up on her humanity and likes to be a ghost, but despite that she had a lot of empathy for her sister since she was willing Kanou disobeys her just to protect her.