Kishou Arima is a famed Special Class Ghoul Investigator known as the CCG's Reaper. He is undefeated as a Ghoul Investigator and at some point was formerly partnered with Take Hirako.
His investigative skills and prowess in combat has led many investigators such as Koutarou Amon to admire him.
Tokyo Ghoul:Re
He later passes down his Yukimura 1/3 (Koukaku) quinque to Sasaki Haise, a rank 1 investigator and mentor of Quinx squad. Along with Akira Mado, he is the overseer of the Quinx squad and keeps a check on Sasaki Haise along with the Quinx members.
(Source: Tokyo Ghoul Wikia)
