Kishou Arima (有馬 貴将, Arima Kishō) was a Special Class Ghoul Investigator famously known as the CCG's Reaper (CCGの死神, Shīshījī no Shinigami). 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 (白い死神, Shiroi Shinigami), among others.

However, beneath the surface, Arima was sided with ghouls as the mysterious One-Eyed King (隻眼の王, Sekigan no Ō). 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.