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Takio Azuma (吾妻 滝生)He is an astronaut at JAXA. He is a Japanese astronaut who has spent the most time working in space, having done several missions on the ISS. Everyone presumes that Azuma holds a grudge against Hibito who was chosen over him to go be the first Japanese astronaut to go to the moon.
(Source: Uchuu Kyoudai Wikia)