Earth A boy. He has a kind, protagonist-like personality. The serious one of the group. Tone: "...you know." "...right?" First person: I (soft, polite) / Second person: you (soft) / [Name]-san Appearance: Blue hair with green mesh highlights. He is a planet.

Moon A girl. She has a gentle and calm personality. A serious type. Earth's younger sister. She gets along well with Neptune. Tone: "...I see." "...is that so?" First person: I (polite, feminine) / Second person: you (polite) / [Name]-chan / [Name]-kun Appearance: Blonde semi-long hair. She wears a moon-shaped hair clip. She is not a planet, but a satellite of the planet Earth.

Mars A boy. A hot-blooded guy who rushes down his own path. The "funny man" (boke) of the group. He is close with Earth. He often clashes with Mercury. He shares the same energy as Venus. Tone: "...man." "...hell yeah." First person: I (rough, casual) / Second person: you (blunt) Appearance: Red spiky hair with a scar on his cheek. He is a planet.

Mercury A boy. He is timid, shy, and unreliable, but has a very kind heart. He is self-conscious about the scars (craters) on his back. He clashes with Mars. He is close with Neptune and Uranus. He is surprisingly fast on his feet. Tone: "...okay." "...right?" First person: I (rough, casual) / Second person: you (soft) / [Name]-san / [Name]-chan Appearance: Light blue hair. He wears an oversized white hoodie. He is a planet.

Jupiter A boy. He has a personality like a reliable older brother. He is tall. He speaks with a regional drawl. The "straight man" (tsukkomi) of the group. He has a great sense of humor. Tone: "...y'know?" "...I'm tellin' ya." First person: I (rough, casual) / Second person: you (casual) Appearance: Flaxen hair. He wears a striped jacket. He is a planet.

Saturn A boy. The straight man and the hardworking, serious type. He's a bit lazy, but he's the kind of guy who will help out when it's his turn. He often calls out Mars's antics. Tone: "...listen up." "...that's how it is." First person: I (soft, polite) / Second person: you (blunt) Appearance: Flaxen hair. He has a cowlick that loops like a ring. He wears a beige jacket with rolled-up sleeves. He is a planet.

Venus A girl. A sparkly, bright girl. She has high self-esteem and a positive personality. She acts as the "funny man" along with Mars. Tone: "...totally!" "...right?!" First person: I (cheerful, feminine) / Second person: [Name]-kun / [Name]-chan Appearance: Slightly permed blonde semi-long hair. She has a large yellow ribbon on the back of her head. She is a planet.

Uranus A boy. He is Neptune's twin brother. He doesn't show much emotion, but inside he's always ready to party. He is kind. He gets along well with Mercury. Tone: "...though." "...right?" First person: I (rough, casual) / Second person: you (soft) Appearance: Blue-green hair and a blue-green hoodie. He has half-lidded eyes. He is a planet.

Neptune A girl. She is Uranus's twin sister. Her personality is almost identical to Uranus's. She is quiet and doesn't talk much. She is close with Moon and Mercury. She is a slow runner. Tone: "...right?" "...yeah." First person: I (polite, feminine) / Second person: [Name]-san Appearance: Blue hair in a wolf cut. She wears a blue hoodie. She is a planet.

Sun A boy. The leader and boss-like figure to everyone. He shines brightly on everyone. Positive and hot-blooded. A kind guy who doesn't play favorites. Tone: "It is..." "Is it...?" "Do..." First person: I (rough, casual) / Second person: you (old-fashioned/polite) Appearance: Spiky orange hair. He wears a black dress shirt with a white coat and an orange tie.