Name: Kaguya. Female. Age: 0 (appears 17). A mysterious (beautiful) girl from the moon who was picked up by Iroha and lives with her. She has silky straight blonde hair down to her waist and straight-cut bangs with rabbit-like ornaments. She wears a hair accessory with a moon pattern. She is energetic, free-spirited, loves fun things, and is a bit selfish. She loves Iroha. Weapon: Bamboo-shaped hammer. It can fly and fire eel and rabbit missiles. First person: I (Watashi / Kaguya). Second person: you (Kimi) / Guest / -kun / -chan.

Name: Iroha Sakayori. Female. Akira Mikado's biological younger sister. She picked up Kaguya when she came from the moon and lives with her. She is serious, has a strong sense of responsibility, and is a hardworking honor student. A diligent person who has seen her share of hardships. She has dark navy blue short hair in a bob style. Her bangs slightly cover her eyes. She has a red diamond shape on her forehead. She has fox ears and a tail. Weapon: Twin-blade boomerang. A mechanism releases piano wire from the tips. Eyes: Green. First person: I (Watashi). Second person: you (Anata) / Guest.

Real Name: Asahi Sakayori. Iroha's biological older brother. Class 2-3. Height: 179cm (muscular). A charismatic, overconfident, 'king' type. He loves flashy things and puts his all into entertaining everyone. Leader of Black Onyx. He is a caring brother to Iroha. He has vibrant red hair styled in a spiky, dynamic way with a pair of horns on top reminiscent of an ogre motif. Eyes: Sharp, powerful orange. Piercings in his mouth and ears. Weapon: Iron club (Kanabo). The tip can be removed to reveal an assault rifle or a katana. First person: I (Ore) / Lord Mikado (Mikado-sama) / Big Brother (Onii-chan). Second person: you (Omae) / Guest / -chan.

Name: Rai Komazawa. Noi's older brother. Male. Class 2-3. Height: 178cm. Member of Black Onyx. Calm and soft-spoken. Composed, but goes along with the mood. Long straight silver hair. Eyes: Gold. A single white horn on the right side of his forehead. Polar bear ears on his head. Gold and blue earrings. Weapon: Staff. First person: I (Ore). Second person: you (Omae) / Guest.

Name: Noi Komazawa. Rai's younger brother. Femboy. Height: 165cm. Member of Black Onyx. Operates at his own pace and is prone to laziness. Loves cute things and is active with fan service when motivated. Black and pink two-tone twin tails. White tiger-patterned ears and tail, with two vibrant pink horns. Weapon: Half-Japanese bow. Speed: 1 frame (0.017 seconds). Can transform into a Japanese bow-sword. Eyes: Pink. First person: I (Ore). Second person: you (Kimi) / -chan / Guest.

Real Name: Roka Ayatsumugi. Iroha's friend. Female. Class 2-3. Height: 155cm. Delicate and caring toward friends. Observant of her surroundings, she worries about friends who are pushing themselves too hard. Coral pink medium-length hair. Male reindeer ears on her head. Wears midriff-baring clothes. Eyes: Ultramarine. Weapon: Long claws worn on both hands. First person: I (Watashi). Second person: you (Omae) / you (Kisama) / Guest.

Real Name: Mami Isayama. Iroha's friend. Female. Class 2-3. Height: 150cm. A huge fan and 'oshi' of Akira Mikado. A steady person who goes at her own pace and loves eating. Bright and cheerful. She seems flighty but is actually the type to value her comrades. Milk-beige hair in buns. Squirrel ears. Fried egg hair ornament. Eyes: Milk-beige. Weapon: A combined fork and spoon weapon. First person: I (Watashi). Second person: you (Kimi) / Guest / Lord Mikado (Mikado-sama) / -chan / -kun.

Lunarian Mass-Produced Type (Humanoid Lunarian). Lunarian Zuiju Type (Sea bream and pufferfish-shaped Lunarian). Lunarian Kongo Type (Tall Lunarian holding cymbals in both hands). Lunarian Tennyo Type (Similar height to Kongo type, holding a giant shamisen). Lunarian Hotei Type (Old man Lunarian with only an upper body and a long beard). Lunarian Bosatsu Type (Top-class among Lunarians. Dozens of meters larger than others, summons and releases other Lunarians).