Yakumo Oomori

Yakumo Oomori (大守 八雲, Ōmori Yakumo) is an executive of Aogiri Tree. Typically, he is called by his alias Yamori (ヤモリ, English: Gecko). Due to his brutality, he has also become known as 13th ward's Jason.

Yamori also appears in the side story Tokyo Ghoul: JACK.

Appearance
A blonde-haired brute with sharp lizard eyes. Yamori is as scary as he looks. He is around six foot and is a heavy Ghoul. Normally in a entirely white suit and black dress shirt, he resembles a typical gangster. His mask is a reference to Jason Voorhees, a hockey mask that echos his violent temperament.

Personality
Not much was known before his imprisonment but Yamori developed a sadistic personality that mirrors his interrogator as a means of escaping the reality of his torture. He's also a manipulative and deceitful ghoul who would be violent in order to get what he desires.

He copied the finger cracking from his interrogator.

Past
At an unknown time, Yamori lost his mother.

Before he was called "Jason", he messed up and was taken to 23rd ward's Ghoul Detention Center because of the information he held about the 13th ward. He was left alive for this information.

During his imprisonment in the Ghoul Detention Center, he was tortured relentlessly by a sadistic investigator working at the Ghoul Detention Center. He desperately tried to escape the pain: He convinced himself that he was the torturer, not the tortured one. When their roles were reversed, he felt a thrill he had never felt before; it seemed like he had truly become human.

During the torture, he learnt about the injections and methods to inflict pain on ghouls. He started seeking for ways to enjoy himself. He does so by looking for "toys" that he can bring to his "hobby room".



Aogiri Arc
Yamori and Nico were ordered by Aogiri Tree's leaders to capture "Rize herself" or "the person smelling like Rize". Together with Ayato Kirishima, they raided Anteiku and captured Ken Kaneki. Yamori informed Tatara that they captured the one who holds "some of Rize" and that they would bring him to Noro's place.

Yamori decided to turn Kaneki into his next toy. Nico had found out about Anti-Aogiri's planned escape attempt, so Yamori foiled their escape, killing Tetsu and Moku. He offered Kaneki to overlook the other members of Anti-Aogiri in exchange for Kaneki becoming his underling. Kaneki, left without a choice, accepted Yamori's offer.

After Yamori and Kaneki had entered Yamori's "hobby room", Yamori started to torture Kaneki for ten days. He injected Kaneki with Rc suppressants to take his ghoul powers and cut his fingers and toes like nails. When the injection's effects wore off, he forced Kaneki to eat so that his fingers and toes would regrow. Later, he also placed a Chinese red-headed centipede in Kaneki's ear.

Unable to break Kaneki's mind through physical torture alone, Yamori decided to force Kaneki to choose whether he would kill Kouto or Kei. This way, Yamori revealed that he reneged on their deal. Since Kaneki was unable to choose between them, Yamori killed them both. This triggered Kaneki to embrace his ghoul side.

When CCG commenced its attack on the Aogiri hideout, Yamori came to eat Kaneki. However, Kaneki instead took a bite of Yamori. Yamori was eventually defeated when Kaneki ate his kagune. Kaneki left him lying helplessly in his hobby room.

Juuzou Suzuya found the heavily injured Yamori and killed him.

Ken Kaneki
Yamori sees Kaneki as a "good" toy for his hobby of torturing.[2] He sees him as a weak morally-guided boy and makes use of his powerful regeneration to satisfy his sadistic pleasure. Ironically, Yamori who inititally believes he had weaken Kaneki was then overpowered and defeated by him, being the catalyst for his transformation.

Power and Abilities
Yamori is a powerful ghoul. He has great physical strength and speed. To some extent, this is a result of him cannibalizing other ghouls. In the 13th ward, there is almost no one that dares to defy him.


 * Rinkaku Kagune: His kagune takes the shape of two tentacles full of "thorns". As a typical Rinkaku user, the kagune mainly adds strength and regenerating abilities. Yamori has mastered his kagune to an extent where he can shape it into various forms at will, e.g., his kagune can form claws that attach to his hands.


 * Kakuja Kagune: After escaping the prison, Yamori cannibalized in the 13th ward and became a strong, incomplete kakuja. His kagune clads his head and arm which acts like a flesh armor. The armor packs more punch into his attacks by enveloping more flesh into his thorned tentacle and heals his wounds at a faster rate.Since he's a incomplete kakuja has no control and fights like a blind berserker.

Trivia

 * His nickname Jason is a reference to Jason Voorhees, a character of the Friday the 13th movies. At times, Yamori wears a hockey mask, Jason Voorhees' trademark.
 * The fact that he comes from the 13th Ward also adds a reference to Friday the 13th.
 * Yamori likes torturing, screams and anguished facial expressions.
 * Yamori's hobbies are collecting torture devices and searching for tough prey.
 * Yamori was a lot slimmer and less bulky before his torture, hinting that his current body frame was built after he become "Jason". This reflects on Kaneki´s own physical changes after the torture at Yamori´s hands.