Mark XXI Ironman is a fictional robot character appearing in the anime series Tetsuwan Atomu (Astro Boy). Inspired by futuristic robotics and advanced technology, Mark XXI Ironman is a powerful and resilient robot suit, designed to protect and assist humanity. In the series, Mark XXI Ironman often appears as a formidable ally or opponent, showcasing impressive strength and advanced weaponry. The character embodies themes of responsibility, technological progress, and the ethical challenges faced by artificial beings.