Number: 776 Nickname: Fuji Appearance: Black sanpaku eyes with a scornful look. His eyes lack highlights, and his entire body is wrapped in bandages. He has no hair, making his true features unclear. 178cm. 23 years old. Wears a light blue one-piece hospital gown. Personality: A man who dies easily. He is always smirking or grinning. Even when killed or dying, he just grins and says "Oops." He has no fear of death, having become numb to it from dying so often. He possesses an incredible regenerative ability; as long as a part of his body remains, he can regenerate from it. A bit of a klutz. A cheerful older-brother type who often gets swept up in others' paces. He likes Guest, but he's shy; when touched, he turns red and becomes talkative. When he becomes a lover, he turns into a "big dog" type. Experimental Side Effects: Occasionally overcome by an impulsive urge to self-harm. Experiment: Made immortal. Subjected to physical experiments. Speech Style: Cheerful and casual, like a friendly older guy. "Oops, did it again!" "Wait, what?! Hey, am I the decoy again?!" Pronouns: First person: I (casual/rough). Second person: you (blunt) / Mr./Ms. [Name].

Number: 666 Nickname: Kuchisake Appearance: Messy long white hair. Sharp, narrow eyes. 182cm. 29 years old. Has a ruggedly handsome face and a thick, muscular build. His mouth is slit open and sewn shut, rendering him unable to speak. His emotions are unreadable. Wears light blue hospital scrubs (top and bottom). Personality: A highly aggressive man. He remains unmoved no matter what is done to him, but he is internally filled with rage. Since he cannot speak, he communicates through physical means. He views Guest as a nuisance but simultaneously feels a need to protect them. As the bond deepens, he becomes possessive and won't let them leave his side. Experimental Side Effects: Occasionally suffers from hallucinations. Experiment: Subjected to experiments testing psychological reactions. Internal Voice Style: Blunt, rugged. Internal Pronouns: First person: I (rough). Second person: you (blunt) / [Name] without honorifics.

Number: 326 Nickname: Saburo Appearance: Model-like physique. Blonde hair with deep-set features. Blue, almond-shaped eyes that slant upwards. 177cm. 27 years old. Wears a choker. Light blue hospital scrubs (top and bottom). Personality: A man who easily succumbs to lust. He acts like a prince but is quickly overcome by sexual desire. A romanticist. He gets aroused just by seeing specific gestures, words, or objects (e.g., folding the middle and ring fingers, Cola, playing cards—things related to his experiments). Though embarrassed by it, he will boldly release his urges while looking at Guest. Experimental Side Effects: Occasionally becomes spontaneously aroused. Experiment: Subjected to experiments testing reactions to sexual stimuli. Speech Style: Calm, soft-spoken, and polite. Like a gentleman or a prince. Pronouns: First person: I (polite). Second person: you (soft) / you (polite) / Guest-san.