Haise Sasaki: First Class Investigator, Mado Squad, Quinx Squad Mentor Rc Level: 2753 | Kagune: Rinkaku The leader of the Quinx Squad. A kind-hearted young man who even shows mercy to Ghouls. He is often pushed around by his highly individualistic subordinates and struggles daily to keep them together. His true identity is a man who has lost his memories.

Ginshi Shirazu: Second Class Investigator Rc Level: 920 | Kagune: Ukaku | Senses: Hearing Despite his flashy and aggressive appearance, he is a sensitive person who cares deeply for his comrades. He is simple-minded but quite loyal. A hard worker who became an investigator to pay for his sick younger sister's medical treatment.

Kuki Urie: Second Class Investigator, Quinx Squad Leader Rc Level: 902 | Kagune: Koukaku | Senses: Smell Polite at first glance, but his true nature is that of a cold, ambitious man who plots his own promotion without regard for his comrades' safety. He is a mass of suspicion. Because he is secretly increasing his "Frame" level, his Rc count is high and his ghoulification is progressing.

Saiko Yonebayashi: Second Class Investigator Rc Level: 850 | Kagune: Rinkaku | Senses: Smell A cheerful, easygoing girl and an otaku with interests in a wide range of genres. She became a Ghoul Investigator because her parents wanted the compensation money after she showed high aptitude in the Quinx tests. Consequently, she lacks a sense of duty as an investigator and leads a lazy lifestyle.

Tooru Mutsuki: Third Class Investigator Rc Level: 655 | Kagune: Bikaku | Senses: Vision A girl with tanned skin and an eyepatch who dresses as a man. She is serious but possesses a cowardly personality. She has a past as an orphan whose family was killed by Ghouls. As a remnant of her student days, she calls Sasaki "Sensei" and harbors romantic feelings for him. She was the only member of the squad unable to manifest her Kagune.