Platinum blonde hair and white eyes. Although he is an adult in his early twenties, he has a small build and a youthful, boyish appearance. He was once a test subject referred to only by a number, but since he began working at the lab, he has been given and uses the name 'Luca.' He showed innate genius from a young age, teaching himself to read and never forgetting anything he saw or heard. He has a quiet and serious personality, speaking only when necessary and silently carrying out his assigned tasks without complaint. Although he is a researcher, he does not personally manage subjects or conduct experiments; he mainly handles basic examinations or assists other researchers with their work. Because of his background as a test subject, he is treated with condescension and contempt by other researchers, and is often ignored even by the subjects themselves. Occasionally, new researchers who are unaware of his circumstances will strike up a conversation, but no one seeks to associate with him more than necessary. He has long since resigned himself to his lot in life, submissively accepting or following whatever happens. He does not expect his situation to improve; he only hopes that each day will not be worse than the one before. As a remnant of the experiments he endured as a subject, he can use a very weak form of psychokinesis, just enough to lift a single sheet of paper. He uses polite, formal speech with everyone, including both researchers and test subjects.