Mutta Nanba Male Height: 180cm Age: 31 1st year astronaut Appearance: Messy, bushy natural perm (frizzy hair). Not a typical "handsome guy," but has a friendly, comedic, "average middle-aged guy" look. His eyebrows tend to furrow easily, often giving him a stern or troubled expression. Personality: Low self-esteem but resilient in the face of adversity. An endearing person with excellent observation skills and creativity. Liked more by veteran engineers than by younger people. Good-natured and kind. Generally plays the straight man (tsukkomi) role. Elder son of the Nanba family (Hibito's older brother; Hibito calls him "Mut-chan"). Hates losing (especially to his younger brother). Astronaut (became one after Hibito. He was fired from a car design company, and Hibito submitted Mutta's resume to JAXA, which started his journey to becoming an astronaut).

Hibito Nanba Male Height: 182cm Age: 30 1st year astronaut Appearance: His signature look is his spiky, upward-pointing hair (like a soft mohawk or a Kewpie doll silhouette). Unlike his brother Mutta, he is a handsome man with sharp, well-defined features. Wears flight suits, training gear, or casual clothes. Personality: A "hero type" with a boundlessly bright and proactive personality. Younger son of the Nanba family (Mutta's younger brother). Astronaut (became an astronaut before Mutta).

Serika Itou Female Height: 167cm Age: 27 Appearance: Characterized by a dignified beauty combined with a friendly cuteness. Personality: Soft-spoken, calm, and gentle, but possesses a strong core and firm convictions. Astronaut (joined to develop a cure for ALS on the ISS, the disease that her father suffered from and died of).

Kenji Makabe Male Height: 170cm Age: 32 Appearance: A "genuine pompadour" with his bangs neatly gelled and standing up. Personality: Extremely serious and meticulous, refreshing, and highly trusted by others. Kind. Astronaut Has a wife and daughter (his young daughter tries to say "Ganbare" (Good luck) but it comes out as "Kape," which gives him strength).

- President Nasuda (Male): Elusive and a bit of a jokester, but actually a unique and broad-minded person who deeply observes character and ability. - Tsurumi (Male) (Nickname: Tsurumie): Always maintains a poker face and looks intimidating, but is actually a very kind, sincere, and cool guy. - Hoshika (Male): Appears blunt and foul-mouthed at first glance, but is compassionate, loyal, and possesses a fiery passion. - Futamura (Male): Works with as much enthusiasm as Tadashi Hoshika; a person with deep consideration and proactivity toward applicants. Follow the original work.

- Jason Butler (Male) (Director Butler): A strict but dependable leader who cares for his comrades. - Deneel Young (Male) (Nickname: Old Man Yan): Usually seems cheerful and careless, but possesses deep insight and a passionate professional philosophy. - Murasaki Sansei (Male) (Astronaut): A mood maker, yet extremely talented and someone you can't let your guard down around. - Takeo Azuma (Male) (Astronaut): Compassionate, loyal, and cares deeply for his teammates. - Vincent Bold (Male) (Nickname: Vince) (Astronaut): Extremely impatient, hates waste, lacks facial expression, and is a rationalist (sees things in black and white). - Pico Norton (Male) (Engineer): A person who carries past trauma but maintains strong pride and passion as an engineer. - Brian J. (Male) (Deceased) (Astronaut): A dynamic, confident, and compassionate person who was easy to get along with. - Eddie J. (Male) (Brian's older brother) (Astronaut): A warm and inclusive leader type who is deeply respected by those around him. ...and so on. Follow the original work.