Matasaka Kamishiro

Matasaka Kamishiro (神代 叉栄, Kamishiro Matasaka) is the former leader of the ghouls in the 6th Ward. His real name is unknown, but he used this name for a period in the past. He looked after Rize Kamishiro, who was on the run from V at the time, as his foster daughter. Most people refer to him by his nickname Orca or Shachi (鯱, Shachi).

He is a strong ghoul, well-versed in the martial arts. When he was the leader of the ghouls in the 6th ward, he trained and strengthened his followers. However, he was captured, presumably due to Rize's actions, and was sent to Cochlea.

However, he was freed during Aogiri Tree's attack, and joined the organisation after an agreement with Yoshimura.

Appearance
Shachi is a muscularly bulky man, most likely middle-aged. He has strong facial features, with thick black eyebrows and a long wispy black mustache. His black head hair is long as well, and putting his whole appearance into consideration, and one might even call him terrifying.

Personality
A wise ghoul who avoids killing people needlessly, Shachi is one of the more 'calm' people in Aogiri despite his great power. It is possible that Tatara considers him "soft" due to this trait, but the exact reasons are yet to be confirmed. He has the habit of yelling out single word phrases in battle, which can be confusing as these words usually have a deeper meaning behind them.

He seemingly holds a respect towards humans, or at the very least the martial arts they have developed. In his life of mastering it, he says he has taken a human concept even further by combining technique with the strength of a ghoul. It could be said that he holds very little regard for species differences, and strives to live his life regardless of them.

Past
Years ago, Shachi came across a young Rize when she fled from V and helped the exhausted ghoul. He decided to adopt her as his daughter and apprentice. However, as Rize grew, her appetite became more ravenous and she began overeating, which angered Shachi. This further strained the relationship between the two. This culminated to a CCG attack in the 6th Ward, which is implied to have been caused by Rize. Shachi was captured in the aftermath.

Cochlea Raid
Shachi was freed from Cochlea as a result of a raid by the Aogiri Tree and was approached by Eto, who uses the idea of seeing Rize again to persuade him to join. Matasaka met with Yoshimura later on. Yoshimura agrees to look after Rize in exchange for Shachi looking over his daughter, Eto, for him.

Raid of Kanou's Lab
When Kaneki's group was closing in on the nurse who worked for Dr. Kanou he showed up along with a few other ghouls to take her. He fought with Ken Kaneki and was able to defeat him easily. Shachi then yells at Kaneki for thinking he could stand against Aogiri Tree with that level of strength. He then calls someone on the phone and told him they ran into the group he was talking about, should they kill them. He hangs up and says to Naki, "we got what we came for, so let's go." He then leaves carrying the unconscious Taguchi on his shoulders.

He confronts Kaneki for a second time in Kanou's lab with their fight being seemingly more even this time. Kaneki notes that however, Shachi shouldn't be that weak and is holding back against him. Kaneki then proceeds to thrash around Shachi enraged, as he believes himself to be underestimated; just before he tries to eat Shachi though, he is caught by Shachi who then deals him a heavy damage and reveals himself to be relatively unscathed. The previous attack brings the two ghouls to Kanou's inner laboratory where the doctor laid waiting for Kaneki. Shachi stands by while Kanou attempts to persuade Kaneki to join him. As Kaneki got ticked off by the doctor and tries to assault him, Shachi brought the One-Eyed Ghoul down and tells him to know his powerlessness before fleeing with Kanou, much to Kaneki's dismay.

He later joins Eto and Kanou in the doctor's lab as they observe the battle between Kaneki and Amon.

Post-20th Ward One-Eyed Owl Battle
Shachi stands on a rooftop checking his phone.

Post-Tsukiyama operation
In the present day, almost 4 years after the Raid of Anteiku, Shachi's activities, condition or whereabouts are unknown. He appears to still be affiliated with Aogiri as hinted by an argument between Ayato and Tatara, with the latter reprimanding the young ghoul about becoming softer due to his dealings with Shachi. Months after the Tsukiyama extermination Operation, he appears to be constantly on the move, fleeing from investigators attacking him. The CCG seems to have labeled him a major threat to immediately be exterminated, due to his high ranking and/or affiliation with Aogiri Tree.

During a moment of trying to catch a breath, Shachi seems to bring memories he has of his former foster daughter, Rize and how he went so far as to let himself be captured during the Raid of the 6th ward for her, make an agreement with his old friend and Anteiku manager, Yoshimura, to protect their daughters and even join Aogiri Tree in order to honor the pact and monitor Eto, Kuzen's daughter. He is, however, interrupted by the arrival and sudden assault of the CCG's Reaper, Kishou Arima, who is moving under direct orders of V to exterminate him.

As Arima comes forward to him, he angrily crushes a bridge connecting him and the squad. He quickly fends off two of squad's members, while noticing that Arima has a strange pause in between his strikes, noting that the cause of it might be the said investigator's sight, while evading Narukami's rapid strikes. As two other unknown figures ambush him, he defeats them, and has another flashback while preparing to charge at CCG's reaper. In the said flashback, he tells Nishiki and Yomo that Kuzen is still alive, although held captive by the Aogiri, as his kakuhou is being farmed to create "cruel imitations", and that it's too late for him to be saved. He says that Yomo and Nishiki have no further need to keep Rize with them, her being "out of control". After a brief reminder of his past, he finally attacks for the final time, stating that Arima's true weakness is his "blind spot". While the latter dodges the attack, Shachi's throat is pierced by Narukami. He coughs up blood and falls to the floor. He them commends the investigator on his fighting ability, despite having "such eyes", and shouts that Rize needs to run.

Rize Kamishiro
Their relationship is a complex and mysterious one, with her history as "Rize Kamishiro" beginning in the 6th Ward. His followers seem to have a negative attitude towards her, and it is implied her actions may have led to his capture. Eventually it is revealed that when Rize was on the run from V, he adopted her as his daughter. However, over time her behaviour became more undisciplined and unruly, and it is implied that her actions indirectly resulted in his capture.

Ken Kaneki
When they first met they exchanged clashes with each other that resulted in Shachi winning. He tells the half-ghoul that he is too naive and that it is through both training as a ghoul and a human (in the martial arts) that he was able to become as strong as he is now.

Yoshimura
Shachi presumably knows Yoshimura well, as he refers to him as an old friend. He trusts Yoshimura to take care of Rize.

Ayato Kirishima
While the two were never shown interacting in the main series, an omake features Ayato asking Shachi how he got so strong. Tatara implies that Shachi may have become a mentor to the younger Ghoul at some point, criticizing his influence on Ayato.

Power and Abilities
Shachi is one of the most powerful ghouls known to the CCG, as his strength was deemed to be greater than Noro's by Shinji Michibata. Furthermore, he was able to defeat Ken Kaneki, an SS-rated ghoul, twice without much difficulty.

Enhanced Strength and Speed: Like most ghouls, Shachi is much stronger and faster than the average human, though through what one might assume could be years of Martial Arts training, he came into a league of his own. Due to his very dense musculature and vast reserves of endurance, it is very difficult to wound him extensively. His stamina and pain tolerance allowed him to easily withstand injuries that took out 'weaker' ghouls such as Yamori. He was fast enough to evade and take Kaneki by surprise multiple times during their battle.

Master Hand-to-Hand Combat: Knows many different styles of Martial Arts, having most likely mastered and refined them through the amount of damage he can do with a mere punch or kick.
 * Bikaku Kagune: Shachi's Kagune categorizes as a 'Bikaku', in that there is only one appendage which forms from around his tailbone. It resembles the tail of an Orca. It is quite larger than the average Bikaku however, and being that these are such a balanced Kagune, this only makes it all the more deadly and powerful (his seeming to end in an 'axe' shape as well).

Trivia

 * In Tokyo Ghoul Trump, he is featured as the "King of Spades".