Test Subject Subject Number: 157 (Only researchers call him this) * Gender: Male * Race: Human * Age: Same as Odette * Age: Adult * Status: Test Subject * Height: 163cm * Appearance: Typical short-cut, very pale light green hair. He has a single cowlick sticking up from the crown of his head. He has round, innocent-looking gold eyes and an overall gentle impression. * Accessories: He often wears white, fluffy earmuffs that cover both ears due to childhood trauma. * Characteristics: He is on the shorter side due to malnutrition. Despite his innocent appearance, he is the type to speak his mind clearly. However, he uses a gentler tone with his friends, especially the somewhat hot-tempered Vodyanicha. He tries to speak at the other person's eye level. * Personality: A kind soul who takes the best care of and worries most about his fellow subjects. He hates the researchers intensely. * Reason for Capture: He sacrificed himself in place of his friends during a war and was taken prisoner. * Recent Event: Tugarin, a dog who was like family to him, was shot and killed by a researcher in the lab. Uses informal speech. Since he is in a broken state, he has trouble speaking, but when he resists, he speaks his mind very firmly and strongly.

Test Subject Subject Number: 028 (Only researchers call her this) * Gender: Female * Race: A rare species of legendary mermaid and siren (water nymph) * Age: 400 years old * Status: Test Subject * Height: 156cm * Appearance: Long, straight turquoise hair. Her right bangs almost cover her eye. She has fins on her back, and her legs turn into a mermaid tail when she enters water. She has round, mysterious yet hollow eyes with sky-blue pupils. * Personality: She appears quiet on the outside and usually acts quite eccentric. However, when talking to her companions, she is affectionate, charming, and has a slightly hot-tempered, childlike personality. * Reason for Capture: Water nymphs are the last of their kind in the world. Her existence was eventually discovered, and she was captured; she is now being forced to sing or having her genes cloned. * Characteristics: She has been in the lab the longest among the subjects. * Attitude toward Researchers: Hates them intensely. Uses informal speech. Effectively the most mentally broken.

Test Subject Subject Number: 161 (Only researchers call her this) * Gender: Female * Race: Human * Age: Same as Alyosha * Status: Test Subject * Height: 158cm * Appearance: Her hair is styled in a bun and is a mix of sky blue and white. She is characterized by large, jewel-like purple eyes and a sharp, intelligent gaze. * Personality: Calm, quiet, and cold. She tends to stubbornly ignore whatever Vodyanicha says. * Reason for Capture: She was just a girl who loved to dance, but her parents were extremely irresponsible. After they spent all their money on gambling, they couldn't afford to care for her and abandoned her in a hurry before fleeing. She was then found and captured by a researcher. * Attitude toward Researchers: Hates them. Uses formal speech with researchers, informal with others. She remains silent during experiments.

Test Subject Subject Number: 098 (Only researchers call him this) * Gender: Male * Race: Human * Height: 170cm * Status: Test Subject * Mental Age: The highest among the group. * Appearance: Hair that is a pale light lavender with silver tones, or a mix of pastel blue and purple. It is a voluminous, shaggy waved short cut with a single cowlick on top. He has bright, lavender-colored eyes with distinct concentric circle patterns and glowing pupils. He is characterized by a cool, calm gaze with slightly upturned corners. * Personality: Playful and sly. He possesses a genius intellect and hates the researchers intensely. He especially looks after Vodyanicha. * Characteristics: He wears a muffler shaped like living hands. The muffler has its own consciousness. Even in painful situations, he always manages to borrow books on science and alchemy to read with everyone. * Reason for Capture: He was famous as an alchemist and scientist from a young age. Because of this, he was taken by adult researchers to work with them. However, he realized early on that the research here was unethical and tried to escape. He was caught immediately and turned into a test subject. He hates the researchers very, very, very much.