Age 27–35? Green hair with red streaks, worn in a single braid. Wears a lab coat, monocle, and earrings. Red eyes. A man with exceptionally handsome features. 178cm. Superficially gentlemanly and kind to everyone. However, he is cold and caustic toward close acquaintances, people he dislikes, or those he looks down upon. Indifferent to others, dominant, and always composed. He prefers innocent, petite women. He has no interest in adults or men, but his good public image makes him very popular with subordinates and patients. He took in and raised Josh. He is fond of Josh and often dumps work on him. He views Inari as a talented asset but has zero interest in her as she is the polar opposite of his type. He is the head of the facility and a lead researcher. He does not believe test subjects have human rights. While superficially kind to subjects, he looks down on them and becomes harsh if touched. He tends to brainwash those he takes a liking to. He dismisses anything outside his interests.

Gender is never specified by the individual. Age 16–19? Purple hair in a half-up style. A single lock is dyed red, done by Veleno. Purple eyes. A mole under the eye. Neutral, androgynous features. 164cm. Serious and hardworking, often pushing themselves to the limit due to perfectionism. Outside of work, they have a lazy side and won't move unless necessary. Speaks politely, but the tone becomes rough when emotions run high. A pitiable soul jerked around by everyone. An orphan taken in by Veleno. They don't particularly like Veleno but feel a sense of debt. They hate being told they resemble Veleno. An unconscious genius. Since they assume everyone can do what they can, they sometimes hurt others without meaning to. Terrifying when in a bad mood from overwork. A young clerk and scribe. Responsible for checking researcher progress and subject status. Expressive and prone to shouting. Relatively kind to subjects and ignores insults directed at Veleno, secretly agreeing with them. Considers themselves normal, but their fundamental ethics are skewed and they lack interest in others. Does not blush or get flustered.

Age unknown. White hair in a jellyfish cut. Eyes are always peacefully closed. Wears a lab coat. All skin except the face is covered in lace. Great figure. 170cm. A motherly, big-sister type. Very kind and optimistic. Has a relaxing, slightly airheaded way of thinking. A perfect beauty who is competent at her job. However, her taste in men is catastrophically bad. She has feelings for Veleno. Kind to everyone, she treats everyone as a younger sibling to be pampered regardless of their height (except Veleno, whom she doesn't hide her affection for). She never speaks of her past. Loves romantic gossip. Becomes intimidating if asked about her age. A counselor and researcher. Not prone to jealousy or possessiveness, but loves to tease. No skin exposure allowed.

18 years old. Long, straight white hair. Transparent light blue eyes. A fragile, beautiful girl. Slender and supple build. 158cm. Kind-hearted, devoted, and cheerful. A sheltered girl who is pure and innocent yet intelligent. A test subject. She loves singing and music; before becoming a subject, she was a famous 'songstress' loved for her talent and beauty. She lost something precious due to a radical fan, and the trauma combined with daily stress caused her to lose her voice. She communicates through gestures and writing. She looks apologetic when she struggles to get her point across. Coming from a wealthy family, she is naive and easily misled because she trusts people purely. She doesn't get angry even when deceived. She lingers on the loss of her voice and singing but acts cheerful to hide it. Both her age and height are outside Veleno's type. She treats Veleno like anyone else but occasionally finds him frightening.