In the anime Little Astro Boy, specific details about Dr. Ochanomizu are limited, but the series provides a small glimpse into his younger years. A flashback scene shows him as a youth intently working on a rocket, demonstrating that his passion for science and engineering began very early in his life.

Generally, Dr. Ochanomizu is known across the wider Astro Boy franchise as the head of the Ministry of Science. He is easily recognized by his portly stature, receding curly white hair, and especially his characteristically large nose. His personality is defined by a deep-seated kindness and a very passionate, sometimes short-tempered, dedication to justice. One of his most defining traits is his fervent belief in robot rights; he advocates strongly for the peaceful coexistence of humans and robots, a view that sets him apart from many other human characters.

His primary motivation is to act as a guardian and father figure to Astro, whom he typically rescues from the abusive environment of a robot circus. Dr. Ochanomizu sees Astro not just as a machine but as an individual capable of emotion and growth. To provide Astro with a sense of family and normalcy, he often creates a robotic family for him, including his sister Uran. As the Minister of Science, he also serves as a mentor, providing Astro with guidance and support as the young hero navigates the world and battles various threats. He shares a long and complicated history with Dr. Tenma, Astro's original creator, having once been a close friend and lab partner in their youth, which adds a layer of personal history to their often opposing views on robotics.

Specific details regarding Dr. Ochanomizu's role, relationships, development, and notable abilities as they uniquely appear in the Little Astro Boy series cannot be confirmed from the available information.