Bio
Kishou Arima was a Special Class Ghoul Investigator famously known as the CCG's Reaper. He was a prominent figure within the organization and was widely regarded as a genius. In the prequel spin-off Tokyo Ghoul: Jack, he is featured alongside Taishi Fura as a teen. He garnered an impressive list of achievements during his eighteen years as an investigator, from leading the prestigious S3 Squad to single-handedly turning the tides of large operations. His lethal battle prowess earned him many names, including the White Reaper, among others. However, beneath the surface, Arima was sided with ghouls as the mysterious One-Eyed King. Conspiring with Eto Yoshimura, he gained the ownership rights of Ken Kaneki after the Owl Suppression Operation and mentored him in preparation to bestow the title to him after his death.

Arima was a tall, well-built man with snow white hair and gray eyes. He always wore a pair of thin-framed glasses and a calm apathetic expression. He always dressed in a professional suit and tie, adding the pure white coat that acted as the S3 Squad uniform during operations. During his youth, Arima had dark blue hair and was much shorter in height. While attending Seishin High School, he wore the standard school uniform. He carried a guitar case with him at all times to conceal his quinque, Yukimura 1/3, as opposed to the standard quinque case.

Arima was shown to have a very calm personality, he remained unperturbed and composed even when surrounded by several ghouls or facing the monstrous One-Eyed Owl. He was also an overly strict mentor, as seen when he reprimanded Hirako for being off on his attack by one decisecond. As a teenager, Arima exerted the same personality, and also noted his main hobby to be ghoul extermination. He had a very cold and calculating approach to exterminating ghouls as shown when he was about to finish off Renji Yomo, and Yoshimura appeared suddenly; instead of panicking or attacking he merely greeted the ghoul. Arima was shown to respect the dead as he reprimanded Itsuki Marude when he talked ill about Mado after his death. Despite his stoic demeanor, he was capable of forming friendships, he often borrowed books from Haise Sasaki, and Akira Mado described his feelings towards Sasaki as "parental love." Arima was also the type of person who complimented his ghoul opponents, an example being when he did so when Kaneki damaged his quinque, IXA.