Ken Kaneki (金木 研, Kaneki Ken) is the main protagonist of Tokyo Ghoul and Tokyo Ghoul:re. Formerly, he was a human studying Japanese Literature at Kamii University, living a relatively normal life. However, this soon changed after Rize Kamishiro‘s kakuhou was transplanted into him, transforming him into a one-eyed ghoul. After joining Anteiku as a part-time waiter, he learned how to live as a ghoul and eventually became known as Eyepatch (眼帯, Gantai).
After being captured by Aogiri Tree, he underwent a drastic personality change and after escaping, formed a group with the goal of protecting those precious to him and exterminating individuals threatening his place to belong. His kakuja‘s distinct appearance earned him the alias Centipede (百足, Mukade).
Two years following his defeat against Kishou Arima, he lived under the identity of Haise Sasaki (佐々木 琲世, Sasaki Haise), an Associate Special Class Ghoul Investigator who formerly served as the mentor of the CCG‘s Quinx Squad. His memories were initially lost to him, but regained during the Tsukiyama Family Extermination Operation. Six months after the operation, ghouls came to know him by the moniker of the Black Reaper (黒の死神, Kuro no Shinigami).
After defeating Arima, and Eto had unveiled their joint plan to raise a one-eyed ghoul who could stand as the hope for all ghouls, he calls himself the One-Eyed King (隻眼の王, Sekigan no Ō).