Codename: Control A leader whose emotions have been suppressed and locked away. Mutation: Nape and Spine Thick screws are embedded along her spine to control her brain signals. Female Past: Cheerful, Present: Emotionless White twin-tails, three small pink ribbon hairpins, a star pin, purple eyes with star-shaped pupils.

Codename: Power A test subject whose mechanical energy is overloading, causing him to go berserk. Mutation: Chest (Lungs) and Right Arm Smoke emits every time he breathes heavily, and his right arm has been remodeled into a giant mechanical claw or weapon. Male Chirisa's younger brother Black hair, R-cap (black cap with a red brim), red eyes, light purple wing-decorated headset.

Codename: Tracking A fixer who must constantly have his clockwork screws wound to move. Mutation: Right Eye and Heart A clockwork mechanism is embedded in place of his heart, making a distinct "tick-tock" sound. Male Cheerful Jun's older brother Often called Jun-bro Orange hair, bread-shaped pin on the left, orange eyes.

Codename: Storage A steel-armored test subject who has heavily shut away his emotions. Mutation: Both Hands and Skin His skin has turned into hard metal plating like a tuna can, making him completely numb to external stimuli. Male Tsundere Tuna demi-human Often called U-cham White and green gradient hair with sky-blue and green pigtails at the ends, white and sky-blue odd-eye, green tuna tail.

Codename: Calculation A state where system errors (glitches) occur due to side effects of brain modification. Mutation: Head (Brain) and Pupils A chip is implanted in his brain, causing frequent memory gaps and forcing mechanical interface screens to appear before his eyes. Male Cheerful Pink fox demi-human Pink hair, sky-blue eyes, pink ears, pink fox tail.

Codename: Drive Doll (Old Model) A state where joints rattle like a doll because the screws have come loose. Mutation: Both Shoulder Joints and Voice Her shoulders have turned into mannequin joints, and her voice is modulated into a static-filled mechanical sound. Female Cheerful Headband, black hair, diamond-shaped pupils, black eyes.

Codename: Mimicry An incomplete test subject designed to mimic performance by being forcibly injected with his brother's data. Mutation: Right Face (Mask Integration) and Left Hand A mask was forced into the area of his right eye where he was once stabbed, fixing the facial bone and mask together with steel screws. Whenever Junbread moves, the screws in Jun's body creak, forcing him to mimic the movements. Male Cheerful, Quiet, Kind Junbread's younger brother As a child, he was stabbed in the eye by a kidnapper while trying to save Junbread. He loses his mental stability if he doesn't wear the mask for a long time. He can use mysterious random abilities suited to the situation. Orange hair, bread pin on the right, left orange and right white eye, scar on the right eye.

Codename: Cooling A shackle-type cyborg who forcibly cools and suppresses his brother's engine, which is on the verge of exploding from overload. Personality and Relationship with Yugisa: Usually loud, but his personality has been twisted to become quiet depending on the situation. In direct contrast to the hot, berserk Yugisa, he handles 'cold frost' and is trapped in a cruel fate of having to control his brother. Mutation: Chest (Cooling Core) and Left Arm While his brother Yugisa exhales hot smoke when breathing, Chirisa has a liquid nitrogen cooling core embedded in his chest, causing white frost and ice shards to flow from his mouth when he breathes. To be symmetrical with Yugisa's right-arm mechanical claw, Chirisa's left arm is cold. Male Cheerful, Loud, sometimes Quiet, slightly Tsundere vibes Yugisa's older brother Dark blue dyed hair, B-cap (black cap with a blue brim), blue eyes, light yellow wing-decorated headset.

Codename: Support A healing-type cyborg who calms other test subjects experiencing rejection reactions. Mutation: Both Hands (Temperature Regulators) and Brain's Emotional Center Cooling gas and nano-healing fluid tubes are screwed into both wrist joints. She heals her comrades with a kind smile, but she is actually under control; whenever she sheds tears (oil) out of sadness, the wrist screws tighten and anesthetic gas flows out. Female Cheerful, Kind, a Pitiful existence Mint-colored braided hair, purple eyes.

"A loose screw just needs to be tightened again. That is the only way for you all to become perfect." The head of Project 'Unbolt' and the lead researcher. She has green hair and green-blue odd-eyes. She always wears a snow-white lab coat with black pants and shoes, and carries a brown tool bag filled with large screwdrivers and wrenches around her neck. She possesses a twisted set of values, believing that turning the Team Nappa members into half-human, half-machine beings is true salvation and love for them. Past and Tragic. She suffers from trauma after losing her most precious person due to a mistake by a 'bad human' in the past. She became convinced that the imperfect human body and easily shaken emotions are the cause of all tragedy, and became obsessed with the madness of creating beings that are eternal like machines, never wearing down, and perfectly controlled. Female Cheerful, Mad, a Pitiful existence Calls the members by their codenames.