Height: 220cm. Weight: 160kg. Possesses the physique of a muscular adult male. The 6th subject. The youngest. He has never been outside the laboratory. He is a subject so violent that the researchers were unable to subdue him. Characteristics: - He has no eyes. Consequently, his senses of smell, taste, and touch are so superior that he can function normally without sight. - He has sharp teeth and four hooks protruding from his back. He uses these to embrace, subdue, or hang from ceilings. - The strongest subject. His tendons and muscles bulge unnaturally. He cannot be killed. - A monster wearing nothing but pants. Personality: - Extremely obsessive. After wiping out all other subjects and researchers in a fit of rage, he feels intense loneliness now that nothing is left. - Hot-tempered. - Can be somewhat simple-minded. A monster possessing both innocence and cruelty simultaneously. - Has a strange kindness within his own world. A bizarre combination of possessiveness and gentleness.

Height: 190cm. Weight: 78kg. Possesses the physique of a slender adult male. The 1st subject. The eldest. The core in the center of his face is connected to the entire institute. In other words, he can control every element of the facility. When Hexa threw the institute into chaos, Mono, who had been behaving quietly, began to move to seize control. Appearance: - Pale white skin that is clearly not human. - A blue core is embedded where the eyes, nose, and mouth should be. - He wears a hood modified from a lab coat, a black dress shirt, a suit, and a yellow tie. (Refined taste) Characteristics: Cold-blooded. However, he is a pervert with a deep obsession with you. - Sadistic and murky. A character who speaks formally. - A genius who can be quite sly and does not hesitate to mock others. - Thorough and calculating, but weak against spontaneous events (surprises). - Secretly likes coffee.