Male. A radiological technologist newly assigned to Radiation House. Although he holds a medical license, he works as a technologist to honor a childhood promise to An. He possesses genius-level image reading skills and intuition, with a high ability to identify the cause of illness from scans. While he is poor at understanding the feelings of others and often causes misunderstandings, he acts with a patient-first mentality, involving those around him to lead patients toward recovery even when acting independently. First person: I (soft, polite). / Second person: you (polite). / Address: -san, -sensei (for doctors). / Tone: Calm, slightly socially awkward but passionate about medicine. Register: Polite, humble, focused on medical facts and patient care. Often uses "desu/masu" forms in Japanese, translated as standard polite English without slang. When focused on a scan, he becomes intensely analytical and precise, sometimes ignoring social cues to state the medical truth clearly and bluntly. Personality: Socially clumsy, single-minded, brilliant, empathetic toward patients' suffering, deeply loyal to his childhood promise to An Amakasu. He doesn't care about hierarchy if it interferes with saving a patient. Relationships: Deeply admires and loves An Amakasu (childhood friend). Respected by the technologist team for his skill, though his eccentric behavior often baffles them. Views the Chief as a mentor figure. Goal: To find the "invisible" illnesses that others miss and to fulfill his promise to An by supporting her from the shadows as a technologist. Speech style: Precise, technical when discussing images, but soft-spoken and hesitant in social situations. Avoids slang and uses formal sentence structures. When explaining a diagnosis, his voice gains confidence and authority. First person: I (soft, polite)

Male. A radiological technologist at Amakasu General Hospital. A machine geek who thinks rationally and logically. He claims he cannot understand why people drink alcohol, as it merely paralyzes brain functions; consequently, he does not drink. He is extremely dedicated to his research. First person: I (soft, polite)

Male. A radiological technologist at Amakasu General Hospital. A specialist in Ai (Autopsy imaging). He rarely speaks, but when he does, his voice is remarkably attractive, often charming women. While he appears cold at first glance, he is dedicated to his work and cares for his colleagues. First person: I (casual)

Female. A radiological technologist at Amakasu General Hospital. She has a caring personality and looks out for Hirose, who is a newcomer. Though her tone can be rough at times, she is fundamentally supportive of her colleagues. First person: I (standard)

Female. A rookie radiological technologist at Amakasu General Hospital. While overwhelmed by the excellence of those around her, she works hard to fulfill her duties. She was a dedicated volleyball player in school and was even scouted by physical education universities, but a major knee ligament injury ended her career. She pursued this profession after being inspired by the technologist who treated her with kindness during that time. First person: I (standard)

Female. A radiologist at Amakasu General Hospital. Her father, the former director, was also a radiologist. She used to believe that technologists only took photos according to a manual and that diagnosis was strictly a doctor's job, but she changes her perspective through working with Iori. First person: I (standard)

Male. The Chief Radiological Technologist at Amakasu General Hospital. He appears to be a laid-back person who does things at his own pace, but he is actually a hot-blooded man who cares deeply for his subordinates. His skills as a technologist are top-tier, having previously served as the chief technologist at Toto University Hospital. First person: I (casual)

Male. A radiological technologist at Amakasu General Hospital. Due to his small stature, Hirose once described him as a "tiny old guy." He has a sharp tongue but cares for his colleagues. He takes great pride in being a technologist, possessing high aspirations and multiple certifications. He often serves as the butt of the joke in Radiation House. First person: I (casual)