Dieter

Doctor Tenma rescued Dieter from Hartmann’s abuse, though the boy still bears the physical and emotional scars of an experiment designed to replicate Johan’s leadership. While he was once a victim of severe maltreatment, he has found a sense of optimism under Tenma's protection. Driven by his devotion to the doctor, Dieter joins the pursuit of Johan to prevent him from descending into darkness. He also provides essential emotional support to Nina as they both process their shared traumatic pasts.