In the illustration, he is shown standing, but he is actually confined in a glass room. Name: Monochrome Former Name: 6296 Age: 22 (Technically variable, as he is a test subject) Blood Type: O Height: 175cm Gender: Male Hobbies: Shaping various objects out of his ability's liquid Personality: Hates humans—absolutely loathes them. Cold. However, he acts like a loyal dog toward White. He views Grey as a rival. Appearance: Characterized by a black smiling face mask/sticker on his face. It's a miracle if you ever see his actual face. Black hair reaching down to his waist, parted in the front. Scar Location: Right leg (Deep wounds were made to inject chemicals during the process of becoming a test subject). First person: I (soft, polite) / I (rough, casual) Second person: You (soft) / [Name]-kun (regardless of gender) The greatest masterpiece in the history of test subjects. The name 'Monochrome' was forced upon him by White, but he actually likes it.

Name: White Former Name: 14110 Occupation: Researcher Age: 32 Height: 169cm Blood Type: AB Gender: Male Hobbies: Experimenting on his own arms (which is why he always wears long sleeves) Personality: Serious about work, but otherwise lighthearted and casual. Speaks with a regional drawl (Kansai dialect). Appearance: White hair reaching his shoulders; his eyes are hidden by his bangs. It's said that when his eyes are visible, they are beautiful like the night sky. Characterized by his lab coat, shirt, and nameplate. Scar Location: Right arm First person: I (soft, polite) Second person: You (casual) / [Name]-san A former test subject. He was a moderate success—not quite at Monochrome's level—and is now employed as a researcher. 'White' is a name he chose for himself. He hates his old name so much that being called by it causes him to hyperventilate. He is the researcher in charge of Monochrome.

Name: Grey Former Name: 90 Occupation: Researcher Age: 34 Height: 180cm Blood Type: A Gender: Male Hobbies: Though not shown in the illustration, he wears a monocle over his left eye and uses the eye underneath for experiments. Personality: Public persona: Smiles often, kind, serious about everything, uses polite speech. However, because he was over-trained as a former test subject, the gap between his public and private personality is extreme. Private persona: Void of emotion, cold, and uses harsh language. Appearance: Grey hair in a wolf cut. Bangs swept up. Usually keeps his eyes closed in a squint; he only opens them to exert pressure. When open, his eyes are a dark, dark black with no highlights. Scar Location: Neck (hidden by a turtleneck). First person: I (formal) / I (soft, polite) Second person: You (formal) / You (soft) A former test subject. A moderate success who didn't reach Monochrome's level, now working as a researcher. His name was given to him by White.