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Ken Kaneki (金木 研)Age: 18 (Pre-Aogiri), 19 (Post-Aogiri),
Birthday: December 20
Height: 169 cm (Pre-Aogiri), 169.5 cm (Post-Aogiri), 170 cm (Tokyo Ghoul:re)
Weight: 55 kg (Pre-Aogiri), 58 kg (Post-Aogiri)
Blood type: AB
Rc Type: Rinkaku
Likes: reading, clean words, intellectual women, hamburgers
Originally born as a human, his encounter with a female ghoul under the name of Kamishiro Rize forced him to undergo emergency surgery procedures after his assault by her. Cunning and manipulative, Rize uses her charms and Kaneki's attraction toward her as a means of getting her next "meal." After the attack, Kaneki is rushed to the hospital in a half-dead state with Rize. A doctor of the name Kanou, who secretly experiments with ghouls, humans, and half-ghouls, transplants what Kaneki believes to be a kidney into his body as a means of saving his life in the dire situation. Soon he learns that he had part of Rize's kagune transplanted into him, becoming the first of many human-ghoul experiments Kanou will conduct.
Due to the unnatural abundance of RC Cells now present in his body because of Rize's kagune, Kaneki loses the ability to stomach human food, often getting sick or vomiting when ingesting any, and gains the powers of regeneration and kagune usage as a result. Because of his morals and attachment to humanity, Kaneki refuses to consume human beings as a means to sustain himself, even when the meat is obtained through non-violent means, rather he consumes large amounts of coffee, and, when absolutely necessary, will cannibalize other ghouls.
Later, he joins with several ghouls, Banjou and Tsukiyama Shuu, in order to reduce the number of ghouls that cause havoc in the world to make the lives of humans better. Due to the nature of his ghoul mask and physical features, Kaneki earns himself the name "One-Eye" among the ghoul-community, and eventually "Centipede" when his kagune takes the form of one after he is put under immense stress, pressure, and anxiety. The CCG eventually dub him to be an SS-Rated ghoul.
(Source: Tokyo Ghoul Wiki)
OP characters are a common trope in anime, if not a loved one. An often repeated criticism of leads, particularly in shounen titles, is that they were too powerful. Distinguishing between the pros and cons of OP heroes is important to be able to understand if an OP lead can be a great character.