Mikio Ageha is a civilian figure in the world of Yamato yo Towa ni: Rebel 3199, serving as the chairman of the Ageha Group, a historic and influential corporation on Earth. Born on July 18, he is 58 years old during the events of the story, with grey-dark hair and blue eyes. As the father of Takeshi Ageha, a pilot in the Yamato air force, Mikio holds a personal stake in the unfolding conflict. He owns the Ageha Museum in the new capital, which houses various works of art, and uses his position and resources to maintain a degree of independence from the Dezarium occupation forces. While he keeps his distance from Dezarium, he sympathizes with Director Todo and the anti-Dezarium faction, aligning himself with those who resist the alien influence over Earth. His motivations are rooted in preserving Earth's cultural heritage and autonomy, and he navigates the politically charged atmosphere with caution, leveraging his corporate influence rather than direct military action. His key relationships include his son Takeshi, whose frontline experiences deepen Mikio's concern for the future, and his connection to the resistance network through Director Todo. Throughout the story, Mikio Ageha develops from a background figure of wealth and heritage into a more active participant in the struggle, using his assets and museum as a gathering point for like-minded individuals. His notable abilities lie not in combat but in his financial sway, historical knowledge, and ability to provide safe harbor and logistical support to those opposing Dezarium's grip on Earth.