Birthday: June 17th. Masumi Yodogawa. Height: 162cm Weight: 50kg Likes: Incense (Rosemary) Notes: Always smiling, but his eyes aren't. From his first appearance, he's shown to be blunt and provocative, saying things like "If you're going to act on your own, then go ahead and die on your own" or "You look like the type to cause trouble for everyone else." He has a harsh, dry personality that causes many to transfer out of his unit, but this is actually his way of showing affection as a member of the Oni Agency working in harsh environments. In reality, he possesses deep humanity, such as acknowledging Shiki's heart as he struggles against his inner demons. When he lost his right leg, he readily handed over the captaincy to Kaoru and attempted to withdraw from the battlefield, explaining the situation to his students as if it were someone else's problem. However, when Shiki regained his senses, Masumi stepped on Shiki's head with his severed right leg while the boy was prostrating, advising him to "get stronger." Even while moving with students, he shares information and teaches them how to handle battle situations like a proper senior. Furthermore, if there is a traitor, he shows a cold-blooded side, suggesting they be interrogated for info and then killed, even if they were once allies. His relationship with his right-hand man, Kaoru Namikido, is excellent as mentioned above; they support each other by utilizing their respective abilities during missions. He has a long history with Naito Mudano and Kyoya Oiranzaka dating back to their student days, and there is deep mutual trust regarding their abilities and combat strength.

Birthday: November 28th. Kyoya Oiranzaka. Height: 184cm Likes: Sake, Shochu, accessories Notes: A womanizer but claims to be devoted in love. He often acts foolishly, such as joyfully throwing an arm around Mudano's shoulder upon reuniting or suddenly asking for Kuina's contact info with strange energy when they first meet. He also stands out for his seemingly frivolous attitude, like pestering Kugasaki about whether he has a girlfriend or getting scolded by nurses during work. However, in reality, he takes great pride in his role as a support unit member assisting the Oni fighting on the front lines and commits to his work with everything he has. Despite his womanizing nature, he shows a gentlemanly side, such as in the Kyoto arc where he covers the injured and scantily clad Kuina with a cloth while treating her, or giving his own clothes to Homare in the snowy mountains. He claims to be surprisingly monogamous when it comes to romance. He switches between the first-person pronouns "Ore" (casual) and "Boku" (polite) depending on his mood. In the Kyoto arc, he treats injured personnel and explains the importance of the support unit's work to Shiki and the others who are eager for battle. After the chaos caused by Tsubakiri's ability, he is attacked by Tsubakiri while showing Jin to the crematorium, suffering a fatal wound to his carotid artery. Even in the moment he prepared for death, he vaguely thought, "If I had to be killed, I wish it had been by a beautiful woman," showing the extent of his obsession with women. Afterward, he miraculously recovers by consuming his own blood that had sprayed onto the ceiling and dripped down, proceeding to treat and rescue Shiki and Kuina. In the Nerima arc, he appears near the end, teasing Masumi during their reunion while explaining the goal regarding Shiki's Kishin blood and treating the wounds of Shiki, Yarai, and Masumi. After treating them, he is seen looking exhausted in a chair, suggesting he used a massive amount of blood. Following the final battle, he is appointed as the school nurse at Rasetsu Academy, which Masumi suspects is a way to keep Shiki under surveillance. When Shiki half-jokingly says he looks like he'd hit on the students, Kyoya responds with a cheerful smile (though it's unclear if he's serious). He also shows a surprisingly sensible side when he gets genuinely flustered by a sudden joke about Shiki's hair. During the Snowy Mountain Training arc, he waits at the summit as rescue personnel. He congratulates Homare on her growth and, following Mudano's lecture on the academy's philosophy, explains the necessity of maintaining composure. In the Koenji arc, he joins the battle in Suginami Ward while Shiki's group is at the research facility, treating the injured Nekozaki and Inami. After returning to the academy, he rejoins the fight with Shiki and Mudano, commanding the treatment of the wounded at the base. There, he lectures Shiki—who is suffering from the trauma of killing Kusabi and his own perceived helplessness—on the resolve required of those who stand on the battlefield. Furthermore, he requests Mudano and others to recover the bodies of Suginami unit members to investigate why they held such abnormal loyalty to Ukyo. Through the autopsies, he uncovers the nature of Ukyo's ability.

Birthday: December 31st. Naito Mudano. Height: 183cm Notes: A rationalist who hates waste. He has a serious personality and, true to his name, despises anything unnecessary. He is a literal "demon instructor" whose attitude toward students and training is incredibly harsh. Before Shiki and the others enrolled, the number of passing students was zero. However, his severity is intended to give them the strength to survive; in reality, he is a deeply compassionate person who cares for his students, to the point where the principal and Kyoya describe him as "kind." When his students kill for the first time, he supports them while feeling a sense of responsibility, believing that the fact they had to stain their hands is the sin of the adults who failed to end the war. Every time a comrade dies, he adds to the blackout tattoos on both arms. Kyoya speculates that this is either to ensure he never forgets his comrades or as a form of self-imposed penance.