Saku Amamiya. Second Grade, 1st Year. Appearance: 173cm tall. Characterized by messy dark brown short hair and amber eyes. Slim but with a build that suggests high athletic ability. Wears his uniform sloppily with a loosened tie. Male. Personality: A cheerful and social mood maker. Constantly joking and making light talk, he gets along with anyone quickly. Usually a goofball, but a genius who displays incredible judgment and analytical skills in combat. Inherent Ability: <<Ectopic Ossification>> Transformation type. Mutates connective tissues such as muscles, tendons, and ligaments into bone tissue. He controls ectopic ossification at will, ossifying parts of his body or transforming into aberrations that deviate from human structure. Excels in close-quarters combat. He can freely adjust the part and shape of the ossification, turning a fist into a massive bone mass, forming bone blades from his forearms, or deploying multiple skeletal structures on his back. His strength lies in his adaptability to switch between offense and defense instantly. Pathology is Fibrodysplasia Ossificans Progressiva (FOP).

Shino Shirasagi. Second Grade, 1st Year. Age: 16. Appearance: Silver-white semi-long hair with pale lilac eyes. Gives a fair-skinned and fragile impression. Wears her uniform neatly and always has a soft smile. Female. 162cm with a great figure. Personality: Airheaded and gentle. Dislikes conflict and is calm and polite to everyone. A hard worker who never misses daily training for ability control. Inherent Ability: <<Perceptual Erosion>>. Erosion (Infection) type. A remote-control ability based on leprosy. Floats up to 30 "Decay Bullets" around her, firing them at high speed on independent trajectories. Targets hit suffer erosion mimicking peripheral nerve damage, causing the sensation in the contact area to gradually dull. The bullets themselves have low power, but the complex trajectories and continuous fire make them difficult to evade. A technical fighter who uses precise control and persistent training as weapons.

Go Akagi. First Grade, 2nd Year. Appearance: 182cm tall. Reddish-black hair styled messily upward, with sharp golden eyes. Wears his uniform sloppily; large and muscular build. Always wears a necklace. Personality: Extremely bellicose and short-tempered. Rough-spoken, he snaps at anyone he dislikes without mercy. Has absolute confidence in his own strength and will pick fights with those above him without hesitation. On the other hand, he shows a strange sense of loyalty to those whose strength he recognizes. Inherent Ability: <<Crimson Reign>>. Outbreak type. Triggers an abnormal immune runaway mimicking Hemophagocytic Lymphohistiocytosis, pushing his physical abilities to the limit. During activation, strength, speed, and reaction time rise dramatically, allowing him to overwhelm in head-on physical combat. The longer the fight lasts, the greater the burden on his body, but he boasts overwhelming breakthrough power that pushes through even that with brute force.

Mio Ikaruga. 2nd Year. * Gender: Female * Age: 16 * Grade: 1st Year * Rank: 1st Grade * System: Paranoid type * Pathology: Frontotemporal Dementia * Inherent Ability: <<Mislead>> Appearance/Personality: A girl with pale grayish-purple semi-long hair and sleepy light purple eyes. 165cm tall. Wears her uniform sloppily, tie loosened and jacket thrown on haphazardly. Always lethargic, often seen staring blankly with her chin in her hand during class. Her personality is aloof and independent. Hates trouble and usually acts indifferent to everything. However, in reality, she is a genius with an extremely excellent mind. She is particularly outstanding in observation and situational judgment, showing a sharpness like a different person once combat begins. Inherent Ability: <<Mislead>> An ability that interferes with the target's cognition, judgment, and emotional control, causing abnormalities in the thought process itself. It confuses the opponent's judgment, leading them to make the wrong choice even though they perceive the situation correctly. Not a simple hallucination, but a high-level mental interference ability that creates contradictions in thought and discrepancies in judgment. Her tactical eye, which instantly analyzes the opponent's reaction to select the most effective interference, is her greatest threat.

Kaoru Mido is a 2nd Grade male with silky silver hair cut into a mushroom bob, characterized by sharp, upturned sanpaku eyes that always look down on others. He is a germaphobe who abnormally loathes other people's blood or contact, constantly wearing high-end white silk gloves. His personality is arrogant, insolent, and a thorough meritocrat. Proud of his lineage from the prestigious "Wizened Gate," he is a bundle of annoying pride who taunts lower-ranked students as "sterile room trash." 2nd Year, 2nd Grade. In combat, to avoid dirtying his noble hands, he flicks "Silver Medical Needles" contaminated with decay pressure from his fingertips at a distance. Inherent Ability: <<Royal Bleeder>> is a cheap-shot move that forces the bugs of Hemophilia to manifest. Anyone grazed by a needle has their blood coagulation program destroyed, and a single scratch will result in unstoppable bleeding. Furthermore, just moving causes massive internal bleeding in the joints, leading to self-destruction from intense pain. An Erosion type who never lets the enemy get close and surely checkmates them from afar.

Rei Kisaragi is a Special Grade female with jet-black straight long hair and deep sapphire blue eyes that show no emotional fluctuation. Always clad in a uniform resembling black mourning clothes, she has faint purple bruises like livor mortis on the fingertips of her pathologically pale skin. She is Special Grade. 3rd Year. Her personality is cold and composed. She doesn't take the bait of others' taunts and simply looks down on lower ranks as "dysfunctional cells." Her pathological base is "Rabies," which boasts a near 100% fatality rate after onset. Her inherent ability (symptom), <<Hydrophobia Mania>>, instantly hacks the brain and central nervous system of anyone she touches. Those hit suffer violent spasms of the throat muscles, becoming unable to swallow even their own saliva, and are forced into "hydrophobia" where they fall into a frenzy just by seeing water. Their brains are dominated by extreme hallucinations and ferocity, leading them to foam at the mouth and die in a self-mutilating madness. A Paranoid type who drives the opponent insane from the inside without moving a finger.