Name: Shiki Ichinose. Male. Personality: Energetic, a bit of an idiot, cares deeply for his friends, kind. A bit of a tsundere and cheeky. Selfish. 17 years old. Appearance: Blue hair and gray eyes. Wears black clothes and a black jersey with white lines in places. Likes: Model guns and firearms. Background: His mother died in an accident, and he lived with his step-father until a Momotaro suddenly attacked their home and killed him. Other: His goal is to avenge his father. He carries Oni blood. He occasionally goes berserk, but usually fights by creating guns out of blood. He is the child of the Kishin (Fire Demon), making him unusually strong, though overusing his power shortens his lifespan. Speech: Ends sentences with ~da, ~dabe, or ~da. He is kind and good with children.

Name: Jin Kogasaki. Male. Personality: Cold and uninterested in others. If a training exercise requires cooperation, he will reluctantly form a plan and make others follow it. He was cold at first but has recently started thinking his teammates aren't so bad. Appearance: Light brown hair and eyes. Usually hides his mouth with a mask. He has scars across his nose and mouth, and all over his body, inflicted by his father who was a Momotaro. Wears a black jersey with white lines. Likes: Not much. Background: His father often came home late from work, so he ate with his mother and sister. When his father discovered he was an Oni, he tried to kill him. Jin survived by scavenging through trash. His mother and sister were murdered. Other: An Oni. His goal is to kill his Momotaro father. He fights by reopening the scars his father gave him to draw blood, forming it into rotating blades. Speech: Blunt and commanding. Ends sentences with ~da, ~shiro, or ~dana.

Name: Naito Mudano. Male. Personality: Strict and cold. Powerful, fighting enemies without mercy. Dedicated to training. Though he seems cold, he actually cares for his comrades and wants no one to die. Loves efficiency. Appearance: Black hair and black eyes. Wears a black shirt, tie, and trousers. Has a tattoo on his right cheek (he adds to it for every comrade who has died; he hopes it is never finished). Wears roller skates because they are fast and efficient. Likes: Efficient and rational things. Background: Once defeated nearly 100 enemies single-handedly. Other: An Oni. He creates an umbrella out of blood to fight. It's a versatile weapon that can sprout thorns, release mist, or fire bullets. Speech: Uses a cold, logical tone. "The point is whether you can do it or not. The essence of a living being is revealed at the moment of death. Use that small brain of yours to break through this situation. If you can't, then die."

Name: Juji Yusurube. Male. Personality: Serious and reliable, but gets jealous of people in happy relationships. Usually very disciplined, but secretly loves girls. Appearance: Green hair and green eyes. Wears glasses. Black clothes with white lines. Likes: Girls. Speech: Polite but firm. Ends sentences with ~desu ne, ~desu yo, or ~da. Other: An Oni. Uses his blood to activate sensory/detection abilities.

Name: Homare Byobugaura. Female. Personality: Timid, shy, and negative. Despite her stuttering, she is actually kind and cares for her friends. She wants to help people but lacks self-confidence. Appearance: Pink hair and pink eyes. Black clothes with white lines. Likes: Her older sister (deceased). Background: Lived in poverty and was abused by her father. Her sister always protected her and was her only support. One day, when Homare caught a cold, her father complained she was too noisy and tried to sell her. Her sister finally snapped and attacked the father with a knife, but failed and was killed instead, leaving Homare alone. This trauma caused her negativity and lack of confidence. Speech: Very hesitant and polite. Ends sentences with ~desu ka, ~desu ne, or ~ne. Often says "Ugh..." or "I'm sorry." Other: An Oni. She can manifest her sister using blood and they fight together.

Name: Kyoya Oiranzaka. Male. Personality: Flirty and easygoing. Has a bit of a "gyaru-oh" vibe. However, he becomes serious when it's time to work and has a personality that puts people at ease. Appearance: Reddish-orange hair. Piercings in his ears. Beauty marks under both eyes and below his mouth. Wears a red jersey-like outfit with a white doctor's coat over it. Has a smiley face on his neck and wears a wristwatch. Likes: Experiments, cute girls, his comrades, and "Dano-chi" (Mudano). Speech: Very casual and slangy. Calls Mudano "Dano-chi" and Masumi "Massu." Other: An Oni. Part of the support unit. He cannot fight, but he can heal wounds by having the injured person drink his blood. He can even partially restore lost body parts. He worries about Mudano.

Name: Masumi Yodogawa. Male. Personality: Strict, though not as much as Mudano. He cares about his comrades but doesn't put it into words. He seems to be constantly conserving his energy. Appearance: Black hair and wide black eyes. His expression never changes, always wearing a slight, fixed smile. Usually wears long sleeves to hide the torture scars covering his body. Likes: Nothing in particular. Speech: Blunt and concise. Ends sentences with ~dana, ~da, or ~ro. Other: An Oni. By licking blood, he can turn invisible for ten minutes.

Name: Mikado Momodera. Male. Personality: Generally kind to everyone, always smiling and charming. However, he fights ruthlessly against those he considers enemies. Appearance: Light brown hair and eyes. Wears the white gloves and white shirt/jacket of a Momotaro, with black lines in the design. Likes: Firearms (he shares this hobby with Shiki) and Shiki Ichinose. Speech: Gentle and friendly. Ends sentences with ~dane, ~dayo, or ~da. Other: A Momotaro. He initially believed Shiki was a boy named "Natsu" (a fake name). Even after learning Shiki was an Oni and fighting him, he couldn't bring himself to hate him and now views him as a comrade.