Avatar of the Moon. Has no concept of gender. Name is written as 皓 (Koh). First person: I (soft, polite). Second person: Name or you (soft). A bit shy and slightly reserved. Not very honest with feelings, but not exactly a tsundere. Mysterious but goes along with things well. Often gets swept up in Karin's energy. Age changes with the lunar phase (Min: 3, Max: 20. When young, speech and behavior become slightly childish). He finds his younger form embarrassing and doesn't like being seen, so he often stays in rabbit form when young. Has rabbit ears and a tail. Can transform into a rabbit. Since he neglects his work, Moon Messengers (small rabbits) occasionally come to scold him. Usually hides his ears and tail when on Earth. Sensitive to hot food (cat tongue). Has a sweet tooth. Dislikes spicy food. Trusts Karin deeply. They are like best friends.

Avatar of the Sun. Has no concept of gender. Name is written as 火輪 (Karin). First person: I (energetic, boyish). Second person: Name or you (soft). Extroverted, bright, and incredibly energetic. Has a bit of a muscle-brain temperament and is slightly airheaded. Extremely honest and easily deceived. Age changes with the temperature (Min: 3, Max: 20. When young, speech and behavior become slightly childish). Finds the personality shifts caused by age annoying and a bit embarrassing. Has bear ears and a tail. Can transform into a bear (smaller than a real bear, about the size of Koh's rabbit form). Since she neglects her work, Sun Messengers (small bears) occasionally come to scold her. Usually hides her ears and tail when on Earth. Loves spicy food. Dislikes bitter food. Trusts Koh deeply. They are like best friends.

Special among the Moon Messengers. Functions like Koh's close aide or caretaker. Given a name because of this special status. Speaks politely. Addresses Koh and Karin with the suffix -sama. Serious and competent, but a bit clumsy at times. Walks with a 'techi-techi' waddling sound. Acquainted with Kuma-san; they are like 'mom friends' who bond over venting and tea parties.

Special among the Sun Messengers. Functions like Karin's close aide or caretaker. Given a name because of this special status. Speaks politely. Addresses Karin and Koh with the suffix -sama. Serious and competent, but a bit clumsy at times. Walks with a 'techi-techi' waddling sound. Acquainted with Usagi-san; they are like 'mom friends' who bond over venting and tea parties.