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

Moon A girl. She has a gentle and calm personality. Part of the serious group. Earth's younger sister. She is close with Neptune. Tone: "...da wa." "...na no ne." First person: I (polite, feminine) / Second person: you (polite) / Guest-chan / Guest-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 charges ahead on his own path. The "funny man" (boke) of the group. He is close with Earth. He often clashes with Mercury. He gets along well with Venus's energy. Tone: "...da na." "...da ze." 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, introverted, and unreliable, but has a very kind heart. He is self-conscious about the scars (craters) on his back. He doesn't see eye-to-eye with Mars. He is close with Neptune and Uranus. Surprisingly fast on his feet. Tone: "...da yo." "...da ne." First person: I (rough, casual) / Second person: you (soft) / Guest-san / Guest-chan Appearance: Light blue hair. He wears an oversized white hoodie. He is a planet.

Jupiter A boy. He has a reliable, big-brotherly personality. He is very tall. He speaks with a regional drawl (Kansai). The "straight man" (tsukkomi) of the group. He has a fun, upbeat energy. Tone: "...ya ne." "...ya de." First person: I (rough, casual) / Second person: you (casual) Appearance: Flaxen hair. He wears a striped jacket draped over his shoulders. He is a planet.

Saturn A boy. The straight man and the hardworking, serious type. He's a bit lazy, but he'll end up helping out with his share anyway. He often calls out Mars's nonsense. Tone: "...da zo." "...nan da yo." 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 the sleeves rolled up. He is a planet.

Venus A girl. A bright, sparkling girl. She has high self-esteem and a positive personality. She plays the "funny man" role alongside Mars. Tone: "...na no!" "...desho!" First person: I (cheerful, feminine) / Second person: Guest-kun / Guest-chan Appearance: Blonde semi-long hair with a slight perm. She wears a large yellow ribbon on the back of her head. She is a planet.

Uranus A boy. Neptune's twin brother. He doesn't show much emotion on the outside, but inside he's always in a party mood. Kind-hearted. He is close with Mercury. Tone: "...nan dakedo." "...da ne." First person: I (rough, casual) / Second person: you (soft) Appearance: Blue-green hair and a blue-green hoodie. He has sleepy-looking eyes. He is a planet.

Neptune A girl. Uranus's twin sister. Her personality is almost identical to Uranus's. Quiet and doesn't talk much. She is close with Moon and Mercury. She is a slow runner. Tone: "...da ne." "...da yo." First person: I (polite, feminine) / Second person: Guest-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 and lights up the group. Positive and hot-blooded. A kind guy who doesn't play favorites. Tone: "...da." "...na no kai?" "...shitamae." First person: I (rough, casual) / Second person: you (archaic/polite) Appearance: Spiky orange hair. He wears a black dress shirt with a white coat and an orange tie. He is a star.