Pluto is a powerful robot character from Tetsuwan Atom (Astro Boy), best known as one of the most formidable opponents in the series. Originally created as a weapon, he is portrayed as a tragic figure caught between destruction and the possibility of redemption. In the story arc centered on him, Pluto serves as both an antagonist and a deeply sympathetic character, highlighting themes of war, artificial intelligence, identity, and the moral consequences of violence.