Koori Ui

Koori Ui (宇井 郡, Ui Kōri) is a Special Class Ghoul Investigator in charge of the 3rd ward and the Investigation Commander of Division I and acts as leader of the S1 Squad. He is a former protégé of Kishou Arima and was the partner of Hairu Ihei before her death.

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 time skip, 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 even jokes 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 Owl Suppression Operation.

After the time skip, 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 Investigator Meeting in spite of being an Associate Special Class Investigator.

Koori joined the battle against the Non-killing Owl and remained fighting until only he and Suzuya were left to the One-Eyed Owl who appeared afterward. Koori managed to hold his own for a while before losing his quinque and was forced to use one of Kousuke 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 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 the S3 Squad.

He arrived at the Auction after having taken part in the defense of the quinque steel transport and gave orders to CCG members.

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

Haise Sasaki visited Koori to ask for permission for his plan, but he rejected since it did not fit the image of the CCG as heroic figures. Afterward, he was smoking a cigarette with Fura. Koori told him Haise was a ghoul and was dangerous, as he had seen Haise lose 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 was approached by Matsuri Washuu, who informed him the S2 Squad was taking part as support. After thinking ill of each other in their inner dialogues, they parted. Koori was then visited by Kishou Arima, who had heard of his operation commander position from Itsuki Marude earlier, and expressed ease since his former superior was the only one he could feel relaxed around after being promoted to Special Class. Koori attempted to tell Arima something but his former superior was called on by a fellow employee and left before anything else could be said.

As the operation commander, Ui commenced the Tsukiyama Family Extermination by entering the Tsukiyama Estate alone, confronting Mirumo Tsukiyama and telling him to surrender. To his surprise, Mirumo swiftly confirmed the employees and his own surrender, but remained distrustful toward the target with the reasoning Mirumo was still 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 contacted Sasaki again for a report on the rooftop's situation and was told by Haise there was nobody despite Shuu Tsukiyama's presence there.

Ui then received a call from Nimura Furuta asking for support. After reaching the location of Furuta, Koori saw the carnage, including the dead body of his partner, Hairu Ihei. After seeing her body, Ui's mind went blank for a short while, recited various Tokyo train station stops in his mind and had a flashback of Hairu, and simultaneously gave out orders instinctively. Upon being notified of a survivor, Ui saw Furuta who seemed to have been brutally beaten and believed his report of the carnage being committed by the ghouls. After reaching the rooftop, Ui seemed 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 was seeing, he confirmed it was Sasaki who defeated the One-Eyed Owl singlehanded and what he was eating was the ghoul's leftover kakuhou. Ui quickly regained his composure and asked Sasaki to wipe off the blood on his head and finish his job, glancing at the worn-out Tsukiyama nearby. He then watched Sasaki throw Tsukiyama off the building with Karren von Rosewald following her master.

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

Rushima Landing Operation
When the CCG had started their attack on Rushima, Ui covered Houji by slaughtering the ghouls ahead. An unknown time later, he entered the room Miza Kusakari (Three Blades) was in before he attacked her and told her to end her life since she would die soon. Next, he ordered Takeomi Kuroiwa, Fura, and Kuramoto Itou to fight with him. Later, Shuu Tsukiyama arrived to assist Naki and Miza. Tsukiyama engaged Ui in battle who eventually swapped places with Kaya Irimi (Black Dog). The two insulted each other during their battle which caused Kaya to be unaware that Fura had taken advantage of her undefended behind. As Ui was about to deliver the final blow, a hooded figure interrupted, saving Kaya.

At an unknown amount of time later as the Rushima Landing Operation had been concluded, Ui was stating that they did not wipe out enough Aogiri as 2% had survived the operation.

Post-Rushima Landing Operation
Koori Ui attended another Special Class Investigator Meeting to discuss Director Tsuneyoshi's will and nomination to appoint Furuta as the next leader of the CCG. However, due to his inexperience and their unfamiliarity with his character, they had him participate in the meeting. After arriving late, Koori asked him about his time with Sasaki. Furuta explained his opinions of "HS" and the infractions Sasaki committed during his time as an investigator.

Following the meeting, Koori smoked against a wall, thinking, when Kuramoto, Takeomi, and Misato Gori pass by him and was acknowledged by Iwao Kuroiwa. As Koori left, he was followed by Kuramoto who inquired about Hirako before sharing his disbelief of the two's betrayal. Koori advised him that to not lose the things most important to him, he must get rid of his personal feelings. Walking away, Koori wondered what was most important to him, realizing he lost all of those who were most important to him; Arima, Hirako, Hairu, and surprisingly, Sasaki, and wondered what he fought for.

After the multiple Clown raids, Koori attends a Special Class strategy meeting to combat them, noting that the Acting Director is absent because of paperwork. He watches as Furuta explains his analysis on the Clown's movements and strategy, impressed by the latter's ability to collect information. After Furuta surmises that the Clowns are attacking on multiple fronts to stretch the CCG thin and leave their main office unguarded, he shoots down Mougan's suggestion of concentrating their force in the main office. When Furuta tells them that Director Yoshitoki left their strongest officer Arima Kishou to defend the main office when he dealt with the Clowns, he reiterates that Arima is dead, but agrees with the plan of having their current strongest officer, Juuzou Suzuya defend the main office. However, he decides to keep Matsuri uninformed to avoid unnecessary sections being involved, and takes responsibilty for it.

After the meeting, he apologizes to Takeomi for summoning his father despite him not being a regular conference member, but Takeomi dismisses it. Koori was surprised when Takeomi told him Urie had predicted what their next move was, noting that he was bright but a poor judge of people. He joins Takeomi and Saiko for lunch, where he meets Takeomi's friend Yoriko. Koori is then subjected to Saiko's spit when the latter spews out her drink in shock of Takeomi proposing to Yoriko.

Koori and Furuta runs into Matsuri who questions them regarding the approval of the plan to defend the CCG branch offices. Matsuri argues that the operation should be approved by a member of the Washuu Clan within the Bureau but Koori retaliates by saying that Furuta is also a member of the Washuu Clan and assumes responsibility for the operation as a special class. Matsuri walks out feeling annoyed while Koori encourages Furuta about his plan.

Clown Siege
While monitoring the operation in the control room, Matsuri remarks that Koori will be demoted to Associate Special Class after the operation. Koori walks out, and instructs Juuzo to protect the main office. Koori then proceeds to command the S1 squad to separate into three groups and provide back up to each ward as he leaves.

Upon discovering that they have killed innocent people who were forced to fight with the Clowns, Mougan asks Koori on how would they be able to deal with the current situation. He also adds that this would greatly damage the morale of the investigators. Koori reluctantly replies, justifying their actions by saying that they are just doing ghoul disposal.

Kishou Arima
Arima is Koori's former mentor, having been partnered together in the past. Koori shared a rather friendly relationship with Arima, being one of the few who Arima has been shown to smile towards. Koori also noted that after being promoted to Special Class, he could not seem to be at ease with anyone other than his former superior. Haise questioned Koori about who Arima was as a person. Koori responded that Arima was an airhead but declares he is a genius.

Take Hirako
As both of them have had Arima as a mentor and partner, they had a friendly relationship with each other and discussed battles. Ui also apparently ranted about various matters frequently when they were together. After Take defected from the CCG, Koori decides to keep his own personal feelings out of the situation but he is hit with a deep sense of loss afterward.

Hairu Ihei
Ihei was Koori's previous partner. While he was shown to have a strict attitude, his partner remained lax and was at most times taking a relaxed attitude to her superior. At the scene of her death, Ui held very strong respect and had a good relationship with his late partner, gripping his quinque tighter and acted 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. However, when Haise betrayed CCG, he was upset about losing a junior he was trying to get close to and teared up.

Powers 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, an SSS-rated ghoul, for a short time.
 * Taruhi: A halberd-shaped koukaku quinque. It has the built-in gimmick able to transform its blade into a bikaku-like whip. It has the ranking of A+.
 * Ajite: An SS-rated koukaku quinque. He owns it yet has never been shown utilizing it as of yet.

Trivia

 * In Tokyo Ghoul Trump he is featured as the "Nine of Diamonds." His card revealed that he smokes cigarettes, but had not been shown smoking in any of his appearances in the manga until the 38th chapter of 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.
 * Koori was ranked twenty-seventh in the latest character popularity poll.
 * He smokes the Hope cigarettes brand.
 * In the English publication of Volume 12, he is incorrectly introduced as female during his debut in chapter 118.

Quotes

 * To One-Eyed Owl: "I'm just a coward, you see...!"
 * To himself: "Most important things? What things? The teachers I respected? The superiors I thought understood me? The colleagues I helped along every step of the way? The successors I saw try their best to bridge the gaps between us? I've lost them all, haven't I...Why do you fight, Koori Ui..."
 * To Furuta: "The able follow opinions they believe are correct. Hold your head high."
 * To himself: "Okahira... connected lives... and the reaper holding the chains. Even so... they say death, too, is but a type of god. And so I will hold fast."

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