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“ | Dr. Tenma said tomorrow will be a good day. | ” |
—Dieter |
Dieter (ディーター, Dītā?) is a former foster child under the care of Mr. Hartmann, who had tried to continue the Kinderheim 511 experiments on him until Dieter was found and rescued by Dr. Kenzō Tenma. Thereafter, Dieter would accompany Tenma in his journeys and regard him as his best friend, despite Tenma's efforts to guide him into a peaceful life. Later, as their travels progressed, Dieter would meet and help a variety of other people, such as Nina Fortner, whom he also befriended and stayed with.
Appearance[]
Dieter is a young boy with short red hair, blue eyes, and pale skin.
Personality[]
Despite his young age, Dieter is an intelligent and resourceful boy. He becomes Dr. Tenma's assistant in his search for Johan and helps him in his investigations. He views Dr. Tenma as a mentor and father figure and strives to follow in his footsteps.
Dieter also serves as a foil to Johan. While Johan is cold and calculating, Dieter is full of empathy and emotion. He cares deeply for the people around him and is willing to put himself in danger to help Dr. Tenma. Dieter's relationship with Johan is also complex, as he struggles with his loyalty to his friend and his growing understanding of Johan's true nature.
Relationships[]
Kenzō Tenma[]

Dieter and Tenma walking away together.
Dieter considers Dr. Tenma his best friend and parental figure, having been rescued from an abusive home by him. As a result, Dieter stubbornly insisted on traveling with Tenma and served as his moral compass during this time.
Nina Fortner[]

Nina and Dieter talking.
Initially based on their mutual fondness for Tenma, the two develop a companionship not too unlike a sibling bond. Dieter even travels with her against her wishes. He cares for Nina's well-being as much as she cares for his, and by the end of the series, they maintain a close bond with constant communication when Nina is away at university.
Julius Reichwein[]

Dieter, Nina, and Reichwein eating together.
Dr. Julius Reichwein takes the role of a guardian regarding Dieter as requested by Tenma and takes care of him in his house in Munich. The relationship between them is not thoroughly explored in the series so it is unclear exactly how strong their bond is, but Dieter continues to stay with him post-series and even considers Reichwein's home to be his as well.