Ken Kaneki

As a child, Kaneki had all the same features he has now as an adult with black hair. As a normal university student, Kaneki was a somewhat short and scrawny young man with little to no athletic background and preferred to read books. After the steel beam incident, Kaneki bears a scar from the transplant operation on the right side of his abdomen not far from his navel. In his free time, he wore casual clothes.

His casual outfit consists of a turquoise hoodie, light black pants, running shoes with a yellow toe and blue outlines reaching the middle of the black base of the soles.

At work, he wore the standard Anteiku waiter uniform, consisting of black trousers and a gray waistcoat over a white dress shirt and a black necktie (brown cravat in the anime). Because he could not yet properly control his single kakugan that manifests in his left eye, he wore a medical eye patch to cover it.

His ghoul mask resembles a leather gimp mask with an eye patch. It bears a lipless mouth with large, gnashing teeth, much like a restrained asylum monster. The bolts sticking out of his neck and the fact that he is an artificial ghoul invoke a Frankenstein-like theme.

After being tortured by Yamori, his appearance changed drastically. His hair became completely white, his nails were blackened, and he developed a more muscular physique. He began to favor monochrome clothing and wore a form-fitting black bodysuit with cutouts when going into battle. His attitude changed as well. He became more cold, and left his innocence behind as he fully embraced his inner ghoul.

In the years since adopting the identity of Haise Sasaki, his hair began to develop black streaks growing out from the crown. He wore the standard business attire of a ghoul investigator, favouring black dress shirts and pinstripe pants with a knee-length white trench coat. He also wears a pair of round eyeglasses when reading. After the events of the Auction Mopping-up Operation, his hair slowly began to revert back to its original color with almost no white remaining.

After the Tsukiyama Family Extermination Operation, his appearance changed drastically again. His hair had completely reverted to its original black colour, and he started wearing his glasses in most scenarios. He wore a black version of the Arima Squad uniform, pairing a black dress shirt with black slacks and a long, black trench coat. In contrast, he wore a pair of red gloves (black gloves in the anime) that disguised his right hand which was covered in reptilian scales. In his second battle with Arima, Sasaki wore a form-fitting black bodysuit underneath his uniform.

Upon regaining his identity as Ken Kaneki, his hair turned completely white again after having his limbs cut off repeatedly by Arima. Unable to heal properly from the incident, both of his arms are covered in reptile-like scales. As a result he continues to wear gloves to cover them with black turtleneck shirts with a pair of white pants. Around his neck, he keeps Touka's parents' ring on a chain, and after their marriage, the scar from her bite mark on his right shoulder. For a time, Kaneki wore a collared black coat over his new sleeveless battle suit with dark gloves reaching past his elbows.

After being held captive and undergoing intense torture at the hands of Yamori, Kaneki's personality changed drastically. He trashed his previous ideology of "being hurt rather than hurting others," pledging to crush those who dared threaten his place of belonging. He adopted the habit of cracking his knuckles from his torturer, Yamori. In his subconscious, Kaneki ate "Rize," the image of his ghoul self. This displayed that he accepted the "ghoul" within him; instead of being influenced by it, he appeared to have become the one to surpass it. Kaneki became ruthless, cruel, and brutal in order to protect his friends, yet he managed to maintain complete composure. He no longer feared his ghoul side and was more violent during battles, such as when he cannibalized Yamori's kagune in order to strengthen himself, and mercilessly broke 103 of Ayato's bones. By embracing his ghoul nature wholeheartedly, Kaneki gave up on being "human."

Kaneki was still capable of showing his gentle nature in front of people he cared about, but instantly turned merciless against his enemies. He yearned for strength and power, therefore becoming more power-hungry and superficially arrogant. His new creed—that as "the strong" he had the right to "devour the weak"—was originally an ideology held by Yamori. Banjou assumed that Kaneki developed some form of mental instability during his torture in the 11th ward, and that this would gradually wear him down.

Whenever he was near starvation and losing control of his kagune (or half-kakuja), he behaved in a way that emulated another's, such as Rize or Yamori. He would speak in a crazed disorganized manner, further implying his mental instability during these periods.

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