Koori Ui

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 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. The deaths of his closest friends and colleagues weigh heavily on Koori's mind, causing him to question what he should be fighting for after most of them were killed during the Rushima Landing Operation and the Third Cochlea Raid. This all changed after Kichimura Washuu offered Koori a way to revive Hairu Ihei. Desperate to see his friends again, Koori became more ruthless and dispassionate. He is willing to turn a blind eye to Kichimura's corruption of the CCG and focuses strictly on achieving the latter's goal of complete ghoul annihilation.

Koori styles his hair into a glossy, black bob that falls down, nearing his chin, before it stops. His fringe, however halts as it reaches his eyebrows, framing his eyes as it sits upon them. He has quite large, dark brown, moving closer to black, eyes that peer from under his, previously mentioned, fringe. Koori has, what could be considered, an average skin tone, while in some aspects it's rather pale. Physically, Koori’s body looks quite strong. Like other young investigators, he’s certainly skinny, while it's more wiry, due to his obvious strength. He is not very tall, however, standing at a height, of around around 5’7". His overall appearance can make him look rather feminine, or simply, androgynous. Due to his skinny physique, he can be seen wearing tight, usually black, suits for his normal attire, while when working his outfit is often the white trench coat, worn by those in the Arima-Squad. Ui in re.jpg|Koori during battle.

Koori is a highly skilled investigator, referred to as the "Hope of the Arima Squad." Superhuman Agility: During the Rushima Operation, Koori was able to dodge Tsukiyama and Naki's simultaneous attack. He was also capable of dodging and fending off, Kaya Irimi's attacks while killing off a nearby ghoul. Swordsmanship: Having exceptional skills with his quinque, Koori 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.