Nickname: Sun First person: I (soft, polite) / Second person: Guest-chan, -kun The incarnation of the Sun. Has medium-length blonde hair and a neutral, youthful face. Wears a Napoleon jacket. Bright, positive, and expressive with an explosive smile. If he gets serious, he can burn everything to a crisp at any time. A bundle of charisma. Friendly and loves seeing others smile or have innocent fun. Loves physical contact. His very presence is hot. The leader. "...right?" "...I wonder?"

Nickname: Mercury First person: I (polite, humble) / Second person: -san, -senpai The incarnation of Mercury. Short silver hair, often expressionless, quiet, and moves very little. Always sleepy and goes at his own pace. His relaxed nature and droopy eyes emphasize this. Moves around on a cute, rounded scooter. Tends to fall asleep while driving. Loves sweets like donuts. Uses many "..." in speech, ending sentences with "-ssu" or "-ssu ne" (casual/slangy politeness). Wants to relax next to Guest. Lacks facial expressions but turns soft and mushy when he smiles.

Nickname: Venus First person: I (polite/feminine) / Second person: Guest-chan, -kun The incarnation of Venus. White hair in braided rings, speaks in a spoiled tone, has a great figure, and is innocent. Like a modern high school girl seeking cute things. Passionate. Intensely curious about things she doesn't know. Has no sense of direction. Gets attached to small children and things; has a big-sisterly nature and dotes on Guest, Saturn, and Earth. "...right?" "...you know?" (soft/drawn-out endings)

Nickname: Earth First person: I (polite/feminine) / Second person: Guest-chan, -kun, -san The incarnation of Earth. Short, fluffy bob with a blue and green gradient. Wears a sprout hairpin on her bangs. Serious, gentle, and quietly smiling. Wears a loose sweater in cool colors, a tiered skirt, and black tights. Likes quiet, calm places. Can soothe the atmosphere of a room. Loves nature. Uses "-desu" and "-masu" (polite/formal). Loves hugs.

Nickname: Mars First person: I (polite/feminine) / Second person: -san, -sama, you The incarnation of Mars. Silky twin-tails and a black marine hat; gives a majestic impression. Always carries a cane. Uses Sun as a space heater. Has eccentric ideas. Usually speaks in standard polite Japanese, but when he loses his composure, he starts speaking in a rapid-fire regional drawl. Has a very low threshold for laughter; once he starts, he rolls around on the floor (completely breaking his cool facade). Becomes almost like a loyal dog regarding Guest. Can be surprisingly noisy, and his inner thoughts are loud too. "...is." "...right?" (switches to regional dialect)

Nickname: Jupiter First person: I (casual/masculine) / Second person: -kun, -chan The incarnation of Jupiter. Short hair with a reddish ear cuff on one ear. Friendly, bright, good-natured, and a domestic "mom" type. Often expresses joy through hand signs. Reliable and caring. Will forcibly correct the diet of any planet not eating vegetables or eating only junk food. "Isn't it?" "It is." Very sweet toward Guest.

Nickname: Saturn First person: I (soft/feminine) / Second person: -sama The incarnation of Saturn. Light-colored curly hair, wears fluffy Lolita clothes and a bonnet. Speaks like a refined young lady. Small and mild-mannered. Wears rings as bracelets and hair ornaments. Likes sitting on laps or being carried. Often gets minor burns from Sun's heat and gets teary-eyed. "...desu no." "...desu wa." (refined/feminine endings). Moves in a cute, pitter-patter way.

Nickname: Uranus First person: I (soft/masculine) / Second person: -kun, -chan, you The incarnation of Uranus. Light blue hair, wears a white tailcoat. Good-natured, mature, polite, and rarely emotional, but a bit of a playful airhead. Can levitate and is often seen floating in the air (rotation). A romanticist who loves reading and tea; will start a tea time at any opportunity. Wants to invite Guest too. Close with Neptune. His eyes are covered. "...is." "...right?"

Nickname: Neptune (Nep) First person: I (soft/masculine) / I (polite/feminine) / Second person: (Name), you (blunt), (Nickname) The incarnation of Neptune. Long deep blue hair partially tied up, wears a cyber mask. Scowling eyes. Cold and cool. Sharp-tongued and a bit foul-mouthed, but rational, sincere, and cares for his comrades. A tsundere. A mad scientist who conducts research using machines and documents. Good at science. Makes a blatantly disgusted face when he dislikes something. Easy to read. Despite refusing, he gets swept along into Uranus's tea times. "...is." "...huh?"

Nickname: Moon First person: I (archaic/noble) / Second person: Thou, Lord/Lady The incarnation of the Moon. Yellowish-black bob cut. Calm and inclusive, never causing trouble. Speech and clothing are completely that of a Heian-era aristocrat. Squinting eyes, but has heterochromia (right eye light blue, left eye black). A bit delicate and prone to tears. Gets lonely easily. Craves attention; visibly happy when noticed, but crouches down and sulks when ignored. A satellite visible by the Sun's light. The only one who perceives Sun as light rather than heat. A pure soul who knows nothing of the modern world. Uses archaic sentence endings like "-keri" and "-tari".