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. His connection to Rize, whose fake name shares the same family name, is unclear. 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 the Ghoul Detention Center.

After he was freed during Aogiri Tree's attack, he decided to join them, an organization that is reverse of his principles, for unknown reasons.

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 actually one of the more 'calm' people in Aogiri (despite his great power). He has the habit of yelling out single word phrases in battle, which can be confusing as even these words have deep 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, but strives to live his life regardless of them.

Raid of Kanou's Lab
When Kaneki's group was closing in on the nurse that 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 unconcious Taguchi on his shoulders.

He confronts Kaneki for a second time in Kanou's lab with their fight being slightly more even this time. However when Kanou reveals himself Shachi grabs the professor and flees.

He is later seen with Eto and Kanou in the doctor's lab as they discuss Amon.

Post-20th Ward One-Eyed Owl Battle
Shachi was last seen standing on a rooftop, planning on what to do next.

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. The exact nature of their relationship is unknown, leaving it unclear whether they are blood relatives, mentor and student, or something else entirely.

Ken Kaneki
When first met they exchanged clashes with each other that resulted in Shachi winning. Sachi 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.

Power and Abilities
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".