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)

Partner(s): Genos Saitama is the most powerful hero alive. Having apparently trained himself to superhuman condition, Saitama faces an existential crisis as he is now too powerful to gain any thrill from his heroic deeds. He is registered with the Heroes Association as a C-Class Superhero and is tasked to defend Z-City against Mysterious Beings. Saitama is usually deliberately drawn in a simpler style than other characters, with a very rounded head and only a simple mouth and eyes. When drawn in a more 'action-oriented' style with more detail, Saitama is revealed to have sharp features, dangerous looking eyes, and chiseled musculature. His costume is a plain yellow jumpsuit with a short zipper at the collar and a belt. The costume is finished out by an ensemble of red boots and gloves, and a white cape. For a superhero, Saitama is rather laid back. Because even the mightiest foes pose no challenge to him, he doesn't take his hero work very seriously. In spite of this, he is constantly searching for an opponent that can challenge him, since his superhero work is beginning to bore him because it's too easy. The combination of his attitude, unstoppable strength, and distinctively simple and 'unimpressive' appearance often cause his battles to become anticlimactic. Saitama will usually allow his opponents to rant about their motives and power up into their strongest forms before suddenly and nonchalantly obliterating them with one punch. (Source: One Punch-Man Wiki)