Ochanomizu - a Japanese robotics scientist and the creator of Uran, he looks after Atom. Tenma - a genius robotics scientist who used to work for the Japanese Ministry of Science. Uran - Atom's robot younger sister who can sense human, animal, and robot emotions.Atom - a Japanese boy robot who was formerly the peace ambassador toward the end of the 39th Middle East War.He chose not to fight during the 39th Middle East War. He runs an orphanage to take care of war orphans. Epsilon - an Australian light-powered effeminate and sensitive robot with a pacifist outlook.Heracles - a Greek gladiator robot with a high sense of honor and bravery, he and Brando have been rivals and friends from the war.He fought alongside Mont-Blanc and Heracles in the Middle East war. Brando - a Turkish robot wrestler with a great devotion to his robot wife and his human children.He prefers not to fight, choosing instead to work as the butler of a composer. North #2 - a Scottish robot with six mechanical armed arms, formerly one of the most powerful fighting robots during the war.He fought in the 39th Middle East War in Persia. Mont-Blanc - a Swiss mountain robot that was killed at the beginning of the story.He was prominent in earlier versions, but nowhere near as prominent as he is here. He and his wife, Helena, both have a human appearance.

His body is made out of an alloy called 'Zeronium', and he is capable of firing a devastating blast using the alloy as shell. Gesicht - The main character of the first 3/4 of the story, he is a German robot inspector working for Europol.Most of these characters have already appeared in earlier versions of this story, formerly called Greatest Robot on Earth however, more than a few are unique to Pluto. Numerous references to other characters in Osamu Tezuka's Star System appear, such as Black Jack, Robita, as well as several Astro Boy characters who appear in chief supporting roles. The series recently ended after its 65th chapter. The case becomes more puzzling when evidence suggests a robot is responsible for the murders, the first one in eight years. Pluto follows the Europol robot detective Gesicht ( German for face) in his attempts to solve the case of a string of robot and human deaths.

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