Kishou Arima

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Ghouls (喰種, gūru, translated as "eating species") are a carnivorous and cannibalistic species, capable of feeding only on humans or other ghouls. They are as similar to humans as possible: they generally have the same external appearance and equally developed intelligence, but their diet, mentality, and internal structure differ slightly from those of humans. In rare cases, human and ghoul individuals are capable of producing offspring (see One-Eyed Ghoul), and ghoul organs can be transplanted (with a low success rate) into a human body.

Because of their diet, ghouls are persecuted by the CCG and are denied any rights in human society, including the right to life.
Diet
Besides water and coffee
Ghouls are capable of feeding only on human flesh or the flesh of other ghouls. Ghouls' taste buds are also different from humans', causing the taste of ordinary food to cause disgust and nausea.
If a ghoul tries to eat human food, it will subsequently experience a strong urge to vomit.
Forcing himself to eat such food will lead to physical deterioration. Ghouls, unlike humans, don't need to feed frequently. They can survive on only one or two months. However, some ghouls eat much more frequently for pleasure.
A prime example is Shu Tsukiyama, who became fixated on eating Kaneki Ken to satisfy his curiosity about the taste of a half-ghoul's flesh. When a ghoul is in a state of extreme hunger, it experiences horrific headaches and loses its sanity, leaving its body driven solely by instinct. To satisfy its hunger, it will attempt to attack any source of human flesh, even its closest friends. Touka Kirishima describes a ghoul's hunger as "a living hell."
Although ghouls can survive for two months without human flesh, some are capable of devouring up to eleven people at once in a short period of time. Such ghouls are also known

Kishou Arima (有馬 貴将, Arima Kishō) is a gifted special-class ghoul investigator known as the Death God. An invincible fighter and former mentor of Take Hirako, he led the elite S3 unit.

Along with Taishi Fura, he is the protagonist of the spin-off Tokyo Ghoul: Jack.

Kisho Arima's skills and combat experience serve as a role model for many other investigators who strive to emulate him.

Appearance

Arima is a tall man with prematurely graying hair. He always wears glasses, and his face maintains a perpetually apathetic expression, rarely showing any emotion. Arima is usually dressed in a detective uniform—a formal suit and tie, with a white coat.

During his youth at Seishin High School, he wore the standard school uniform. He also always carried a guitar case on his back, containing his quinque, Yukimura, which he used in battle against ghouls. Back then, Arima's hair was dark blue.
Personality

Arima is always very calm, maintaining his composure even when surrounded by twenty-five ghouls. He is also a very strict mentor, as demonstrated by the scene in which he scolds Hirako for a 0.01-second delay.

As a teenager, Arima's personality was no different from his current one; the young man considered exterminating ghouls his main hobby. He has a very cold and calculating approach to this task, as demonstrated in his battle with Renji, and after Yoshimura's sudden appearance, Arima, instead of panicking or attacking, calmly greets him. Furthermore, Kisho is shown to respect and honor the memory of his fallen colleagues; for example, he once reprimands Itsuki Maruda for speaking unflatteringly of the late Mado after his death.

Despite the author's claims that Arima is a ruthless, cold-blooded sadist, the character himself hasn't shown any overt sadistic tendencies. Despite his stoic personality, he's capable of approaching and befriending people; taking responsibility