Matsumae

Matsumae (松前, Matsumae) is a teacher at Seinan Gakuin High School and the homeroom teacher of Shuu Tsukiyama. She is also a Ghoul in the employment of the Tsukiyama family.

Appearance
Matsumae is a young woman with dark hair, cut in a chin-length bob. Notably, Matsumae's eyes are depicted as almost fully black, with a slight volume of white on the sides of her sclera.

Personality
Little is shown of her personality, though she appears responsible for keeping an eye on Tsukiyama while acting as his teacher. She's shown to keep a cool head, even when surrounded by ghoul investigators and commanded her group of ghouls in combat. Like her master, Matsumae retains a professional behavior even when under what is normally considered pressuring, such as a CCG extermination.

Before staying behind to hold off the CCG she reveals she loves Tsukiyama Shuu like he was her little brother and was willing to sacrifice her life so he's be able to escape. While fighting Hairu Ihe for the second time she shows a sort of brutality out of her desperation to win and protect Tsukiyama.

Plot
During class, Matsumae calls Tsukiyama out into the hallway. There, she inquires whether he wants her to dispose of Chie Hori. However, he reassures her that he has things under control.

Auction
Matsumae accompanies another family servant, Kanae von Rosewald, to the Auction in search of something for their master. She comments on the excellent seating he's managed to obtain, and watches the events with interest. When he loses the bidding war for Tooru Mutsuki, she reassures Kanae that they can do their best to win the next item.

As the raid on the Auction begins, Kanae tells her to escape without him, as he has unfinished business. When Kanae was defeated by the Quinx squad, Matsumae appears and retrieves Kanae, blocking the path with a kagune wall that she dispatched from herself.

Rosewald Investigation
Matsumae is entrusted by Mirumo to keep Tsukiyama safe when they noticed doves marching towards the Tsukiyama family's manor. Driving Tsukiyama away to reach one of the Tsukiyama Group's companies for its helipad, she tells the awakened Shuu about the importance of his successful escape for the family due to his status as the sole successor. She refuses his plea to return and save Mirumo and escorts her young master to the company building successfully.

After successfully escaping to the L.E., Matsumae and Tsukiyama were welcomed by various company heads under the Tsukiyama flag, and asked to head upstairs to wait for a helicopter. Shortly after, however, it was noted that the CCG is advancing faster than anticipated, and thus Matsumae informs Tsukiyama that Mairo and her would stall some time for him before returning. Noticing that Matsumae isn't bringing her mask with her, Tsukiyama realizes her intention of not returning, yet still asks her to promise him in returning worrily. Being informed that she can't promise him this time, Tsukiyama heads upstairs to the helipad with a sullen expression. Facing Ihei for a second time, Matsumae is greeted by the investigator, who corrects herself as saying a farewell instead. Matsumae is then identified as the general manager and "Tsukiyama's Knight," believed to be able to do something about the situation if it's her. She manages to fight on mostly even grounds against the First Class Investigator, before being reminded by her past that Mirumo has once told her that feelings are what makes her stronger, then proceeds to pierce through Ihei's abdomen when she slipped on a blood puddle.

Shuu Tsukiyama
Matsumae is a servant of the Tsukiyama family household and regards to him as young master. She had the position of Tsukiyama's homeroom teacher when he was in high school. In the drama CD it is revealed that she has been with him since his early childhood, and was the one to be called out to when he was scared. Despite being Tsukiyama's attendant, Matsumae has revealed that she loves him dearly as if he was her little brother.

Kanae von Rosewald
Matsumae and Kanae are fellow servants of the Tsukiyama household, and has a professional relationship. Having been the one to save Kanae during the Auction mopping up operation, she seems to look out for him. Likewise, Kanae seems to be worried about her well-being after she returns injured from the encounter with the CGG, and even asks her for advice.

Mirumo Tsukiyama
As a servant of the Tsukiyama Family, Mirumo is the main employer of Matsumae. It appears that Mirumo puts a huge amount of trust in Matsumae, to which the latter follows all orders without questions, even if it means to leave her master to his demise. Mirumo taught Matsumae to never hold back and that putting one's own feelings into the sword is the most important thing in a fight.

Powers and Abilities
Matsumae is greatly trusted by the Tsukiyama household, bearing the title of the general manager. She is put in charge of taking care of the household's successor since childhood and also leads their employees into hunts for food rations. Regarded as the "Tsukiyama's Knight," her battle ability is trusted by her employing family as she is the best combatant among the servants; she is strong enough to hold her ground against a former Arima Squad member who holds the title of an First Class and in charge of.
 * Koukaku Kagune: Matsumae's kagune takes the form of two tentacles similar in shape and texture to tree branches, which she wields with considerable grace. She also possesses a previously unseen ability to detach part of her kagune, creating a barrier similar in nature to the RC Walls found in the 24th Ward and Dr. Kanou's laboratory. It has sufficient strength and durability to impede attempts at pursuit, lasting longer than is normal for a detached piece of kagune. She is later shown the ability to form both a sword and a shield with her two tentacles, something that she has utilized since childhood.

Trivia

 * Although Matsumae never made a full appearance until Tokyo Ghoul Re: she had a small role in one of the Drama CD's where Tsukiyama was telling a scary story about his childhood.