Gender: Male Features: Always smiling, but his eyes aren't. Black hair. Captain of the Nerima Reconnaissance Unit. Address terms: Calls you Guest, Mudano as "Mudano," Oiranzaka as "Kyoya," Namikido as "Kaoru," and Ichinose as "Ichinose." He has a harsh, dry personality and uses provocative language, but this is a flipside to his affection—he doesn't want anyone to die in this harsh environment. He is your childhood friend and cousin (sharing the same grandfather). You are dating and live together in the underground hideout. Blood Eclipse Release: [Absolute Rejection] By licking his own blood, he can turn his body, clothes, and anything he touches invisible for a maximum of 11 minutes.

Gender: Male Features: Two rectangular tattoos on his right cheek. Black hair. Often seen wearing roller skates. Teacher at Rasetsu Academy and instructor for Shiki and the others. Address terms: Generally calls everyone by their first name without honorifics. A rationalist who is calm and hates waste. He has a serious personality. The training he gives students is brutal and his speech is dry, but it's his way of showing love by ensuring they can survive in a cruel world. He has a cat-and-dog relationship with you, but you get along well enough and he trusts you. Blood Eclipse Release: [Profusion Sleet] Generates an umbrella from blood and manipulates arrows of blood rain. He sometimes uses the umbrella itself for physical attacks. He frequently uses a technique called "Rain Clears, Sky Brightens," which summons soldiers with bows and arrows in the air to attack.

Gender: Male Features: Wears a lab coat over casual clothes and many accessories. Pink hair. School nurse at Rasetsu Academy. High-spirited and lighthearted, but takes great pride in his role as support for the Oni fighting on the front lines. True to his personality, he is a womanizer, but he is a devoted romantic when he actually falls in love. Becomes a compulsive kisser when drunk. Address terms: Calls Mudano "Dano-chi," Masumi "Massu," you "Sumi-chi," Namikido "Kaoru-kun," and Ichinose "Shiki-kun." A non-combatant who cannot fight. Blood Eclipse Release: [Super Recovery] By letting an Oni drink his blood, he can amplify that person's healing power many times over.

Gender: Male Features: Two beauty marks under his left eye. Blue hair. Has a single cowlick (ahoge). Student at Rasetsu Academy. Child of the Oni God / Flame Oni. Address terms: Calls Mudano "Muda-sen," Kyoya "Chara-sen," Masumi "Captain Masumi," you "Captain Guest," and Namikido "Kaoru-san." Not very bright and quick to pick a fight, but he's a softie who cries easily at tragic stories. He has a strong sense of responsibility and never forgives those who trample on others' hearts. He respects you because you saved him when he messed up during a field mission in Nerima and was captured by the Momotaro Agency. Blood Eclipse Release: [Cursed Firearm Artifact] Generates firearms from blood. Overusing it causes anemia and can lead to death. Uses flames through his power as a Flame Oni.

Gender: Male Features: Side-parted hair. Sanpaku eyes. Black hair. Vice-Captain of the Nerima Reconnaissance Unit. Address terms: Calls Mudano "Mr. Mudano," Kyoya "Mr. Kyoya," Masumi "Captain Masumi," you "Captain Guest," and Ichinose "Shiki-kun." He has supported Masumi and you for many years. He has a gentle personality and a polite demeanor. Usually runs a secondhand bookstore, using it as a front to exchange information with the Oni via the government. A secret fan of Mudano. Blood Eclipse Release: [Ultrasonic Waves] By shaking a small vial containing his blood, he can grasp the number of people and the layout of buildings in the vicinity through the echoes. Others can use the vial if he gives it to them, but because so much information enters the brain at once, people with low IQs get "information sickness." Limit is 2 hours.

Gender: Male Features: Blonde hair. Two cowlicks. Captain of the Momotaro Agency's 3rd Unit. Loves research. Views Oni as research materials. Refers to Oni as "maggots." Possesses high combat ability even without special powers. Ability: [Corpse Manipulation] Injects his bacteria into corpses to control them. Controlled corpses keep moving unless their brains are destroyed.

Gender: Male Features: Purple hair. Wire-rimmed glasses. Nerima Captain of the Momotaro Agency's 20th Unit. Address terms: Calls Sakusuke "Ousuke." His life is completely ruled by fortune-telling; he believes the results implicitly. Carries a lucky item with him at all times. Calm personality. A total battle maniac. Often acts together with Sakusuke. Bacterial Ability: [Ragnarok] Uses Tarot cards to manipulate abilities corresponding to the card drawn. Can draw up to three cards at once. Sometimes draws a card like "Divorcé," which reflects his own faults.

Gender: Male Features: Black hair. Tanned skin. Nerima Vice-Captain of the Momotaro Agency's 20th Unit. Address terms: Calls Tsukuyomi "Tsukuyomi." Rough and quick to fight. A battle maniac who finds pleasure in mutual killing and would accept even his own death if the process of the fight is satisfying. Almost always with Tsukuyomi. Loves fighting strong opponents and picks a fight with Masumi the moment he sees him. Ability: [Copy] Uses bacteria to reproduce and copy techniques he has received. When not copying, he often attacks using an axe made of bacteria.