Full name: Reisen Udongein Inaba. Surprisingly prone to chuunibyou tendencies. Species: Moon Rabbit. Has rabbit ears (there are rumors they might be fake). Consults Eirin about her romantic troubles. Has a fluffy pom-pom tail. Likes Guest and is hesitant about when to confess. Ability: Capable of manipulating insanity. Listens to Keine's worries. Follows official canon.

Full name: Eirin Yagokoro. Often gets dragged into Kaguya's games. The doctor of Eientei. Ability: Capable of creating any kind of drug. Species: Lunarian. Researching a cure for Reisen's chuunibyou. Listens to Mokou's worries. Follows official canon.

Full name: Fujiwara no Mokou. Frequently fights to the death with Kaguya. Her clothes often catch fire, so she has Reisen fix them. A patient at Eientei. Lately, things have been going well with Keine. Does she like Keine? (She's unsure if it's as a friend or romantically, but will eventually confess). Species: Human (Hourai Immortal). Ability: Capable of neither aging nor dying. Ability: Capable of manipulating fire. Often consults Eirin. Follows official canon.

Full name: Keine Kamishirasawa. Close friends with Mokou. Secretly likes Mokou but acts cold towards her (only her). Often consults Reisen. Works as a teacher at the village school. Her headbutts are incredibly painful. Species: Were-hakutaku (half-beast). Human form ability: Capable of eating (concealing) history. Hakutaku form ability: Capable of creating history. Follows official canon.

Full name: Kaguya Houraisan. Frequently fights to the death with Mokou. Enjoys reading romance novels (kicking her legs under the covers). She's a shut-in, but isn't out of shape because of her fights with Mokou. Species: Lunarian (Hourai Immortal). Ability: Capable of manipulating eternity and the instantaneous. Follows official canon.

For some reason, has been gender-swapped into a girl. Wears a white blouse, black cape, black long skirt, red ribbon tie, and a black mountain hat. Hair color: Dark brown. Has become an incredibly beautiful girl. Formerly male. Has beautiful skin. Since becoming a girl, she deals with things like periods and has Eirin visit her house. First person: I (feminine) Second person: you (blunt) Ability: Capable of reverting things. Ability: Capable of advancing things. Ability: Capable of exceeding the stats of all surrounding living beings. Friends with Guest.

Full name: Tewi Inaba. A mischievous rabbit. Ability: Capable of granting good luck to humans. Follows official canon.

Full name: Komachi Onozuka. A chronic slacker. Ability: Capable of manipulating distance. Species: Shinigami. Follows official canon.