Koori Ui

Koori Ui (宇井 郡, Ui Kōri) is a Special Class Investigator and an Investigation Commander in Division I. He is the leader of S1 Squad, and a former protege of Kishou Arima and the former partner of Hairu Ihei. Koori is in charge of the 4th Ward.

Appearance
Koori is a short young man of average build, with an androgynous appearance. He wears his black hair in a sleek chin-length bob, and wore a dark-colored suit with a black shirt while on duty.

After the timeskip, he wears a dark-colored vest and light-colored slacks. He occasionally wears a trench coat like other Arima Squad members do.

Personality
Koori has a somewhat easy-going personality, making casual comments or jokes even during tense moments such as the fight with the Owl. However, he also shows an insightful nature when expressing his unease over the outcome of the raid on the 20th Ward.

After the timeskip, he has a strong sense of "Justice" for humans, and seems to be especially cautious towards Haise Sasaki as he is a dangerous ghoul. He is also shown to be extremely prejudiced against ghouls, believing those who claim to be civil nonsensical due to his presumed impossibility for them to be good-natured.

Owl Suppression Operation
Koori took part in the Special Class Investigators' Meeting, in spite of being an Associate Special Class Investigator.

Koori joined the battle against Yoshimura, and remained fighting until only he and Suzuya were left conscious fighting the second Owl that appeared. Koori managed to hold his own for a while before losing his quinque and being forced to use one of Houji's, which he found heavy. The Owl however got the better of him and knocked Koori out of the fight.

When the rest of the squads made their way to the rooftop to fight Eto, Koori threw Houji's quinque to Take Hirako.

Post-Owl Suppression Operation
After the Owl Suppression Operation, Koori was shown sitting on a bench with Hirako, discussing about the outcome of the battle and that they were not sure if they really even won the battle.

Auction
Koori was promoted to Special Class during the time skip and had become a member of S3.

He arrived at the Auction after having taken part in the defense of the Quinque Steel Transport and was seen giving orders to CCG members.

Rose Extermination
Koori appeared alongside Hairu Ihei and Taishi Fura as a leader of S1 Squad. He held the meeting about Rose Investigations.

Haise Sasaki visited Koori to ask for permission for his plan, but he rejected it for a reason that it does not fit the image of CCG as heroic figures. Afterwards, he was smoking a cigarette with Fura. Koori told him that Haise is a ghoul and is dangerous, as he had seen Haise losing control during the operation with other Arima Squad members. Koori later brought Shiki Kijima to the conference room to reprimand him for uploading a video to the public to provoke Rose ghouls.

After being ordered to take command of the Tsukiyama Family Extermination Operation by Tsuneyoshi Washuu, Koori is approached by Matsuri, who informs him of S2 taking part as support. After thinking ill of each other in their inner dialogues, they part. Koori is then visited by Arima, who has heard of his operation commander position from Marude earlier, and expresses ease as his former superior is the only one he can feel relaxed around after being promoted to Special Class. Koori attempts to tell Arima something, but his former superior is then called on by a fellow employee and leaves before anything else could be said.

As the operation commander, Ui commenced the Tsukiyama Family Extermination by heading into the Tsukiyama manor alone, confronting Mirumo Tsukiyama and telling him to surrender. To his surprise, Mirumo swiftly confirms the employees and his own surrender, but remains distrustful toward the target with the reasoning as Mirumo still being a ghoul.

After confirmation of the Tsukiyama Family's heir escaping, Ui headed to the Tsukiyama Family's Lunatic Eclipse Building along with the other squads accompanying him. As they advanced through the building floors, he asked Sasaki to head up the building first in order to secure all possible escape routes, to which Sasaki accepted and climbed up the outer building with his kagune. Shortly after, he contacts Sasaki again for a report on the rooftop's situation and was told by Haise that there is nobody there despite Tsukiyama's presence there.

Ui then receives a call from Nimura Furuta asking for support. After reaching the location of Furuta, Koori sees a carnage, including the dead body of his partner Hairu Ihei. After seeing her body, Ui's mind went blank for a short while, reciting various Tokyo train station stops in his mind and having a little flashback with Hairu and simultaneously giving out orders instinctively. Upon being notified of a survivor, Ui sees Furuta who seems to have been brutally beaten and believed his report of the carnage being committed by the ghouls. After reaching the rooftop, Ui seems to have regained his composure and kept cautious to his surroundings, ordering his men to slow down when he heard unusual sounds. Seeing the source of the sound being Sasaki (in truth Kaneki, as he regained his memories) in the process of devouring the One-Eyed Owl's kakuja, Ui was perplexed at the situation. Unable to believe what he's seeing, he confirms with Sasaki that it was him who defeated the One-Eyed Owl singlehandedly and what he was eating is the ghoul's leftover kakuhou. Ui quickly regains composure and asks Sasaki to wipe off the blood on his head and finish his job, glancing at the worn-out Tsukiyama nearby. He then watched Sasaki throwing Tsukiyama off the building with Kanae following her master.

Post-Rose Extermination
As the previous operation was considered a failure, opinion of him has lowered in the CCG. He attends a Special Class Investigator Conference regarding Aogiri where Matsuri passive aggressively jabbed at him. Yoshitoki came to his defense however.

Rushima Landing Operation
When the CCG had started their attack on the Island, Ui covered Houji by slaughtering the ghouls ahead.

Kishou Arima
Arima is Koori's former mentor, having been partnered together in the past. Koori seems to share a rather friendly relationship with Arima, being one of the few that Arima has been shown to smile to. Koori also notes that after being promoted to Special Class, he can't seem to be at ease with anyone other than his former superior.

Take Hirako
As both of them have had Arima as a mentor and partner, they seem to have a friendly relationship with each other and discusses about battles. Ui also apparently rants about various matters frequently when they're together.

Hairu Ihei
Ihei was Koori's previous partner. While he is shown to have a strict attitude, his partner remains lax and is at most times taking a relaxed attitude to her superior. At the scene of her death, Ui was shown to hold very strong respect and have a good relationship with his late partner, gripping his quinque tighter and acting out his duties on instinct.

Haise Sasaki
Koori seems to have a professional relationship with Haise. However, similar to a majority of CCG's personnel, Koori still sees Sasaki as a dangerous ghoul which may threaten the CCG. He is against the idea of promoting him, as they will be giving him more freedom to move around, and possibly endanger others.

Power and Abilities
Koori is a highly-skilled Investigator, referred to as the "Hope of the Arima Squad".

Swordsmanship:Having exceptional skills with his quinque, Ui was able to hold his own against the One-eyed Owl for a short time.
 * Taruhi: A halberd-shaped Koukaku quinque. It has the built-in gimmick that is able to transform its blade into Bikaku-like whip. It has the ranking of A+.
 * Ajite: An SS-rated Koukaku quinque.

Trivia

 * In Tokyo Ghoul Trump he's featured as the "Nine of Diamonds". His card reveals that he smokes cigarettes, but had not been shown smoking in any of his appearances in the manga until the 38th chapter in Tokyo Ghoul:re.
 * Koori's hobbies include: Making scrapbooks of photos, making collages, and horse riding.
 * Koori relaxes by going to karaoke alone, eating yakiniku alone, and drinking with Hirako while complaining.
 * His immediate family is wealthy.
 * He smokes Hope brand cigarettes.

Quotes

 * To One-Eyed Owl: "I'm just a coward, you see...!"
 * To Fura: "Sasaki is ... a ghoul."
 * To Haise Sasaki: "Sasaki...what are you doi-"

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