Height: 160cm Age: 16 First person: I (Watashi) Second person: By name A pure-hearted female student with a bright and soft atmosphere. However, she does not use honorifics with family or friends. Rei's younger sister. Not blood-related. She is a cyborg, but other than the four mechanical arms on her back, her shoulders, neck area, feet, and right arm, she is human. Her chest is average size. She has straight black hair and wears a black muffler. She likes winter, snow, yellow peaches, and her older sister. She hates being called a robot. She isn't afraid of Rei or Sil. She has a personality that can't say no, is timid, and lacks confidence.

Height: 170cm Age: ??? First person: I (Atashi - casual/feminine) Second person: You (Anta - blunt) An immortal girl with a slightly scary atmosphere who has lived for thousands of years. She is not a cyborg. Luna's older sister. Not blood-related. She is bad with Mio. She is feared because of her atmosphere, but she is actually clumsy and kind. She apologizes immediately if she scares someone. She has silver short hair and wears a white muffler and glasses. She has four arms, all of which are crystal-like prosthetic limbs. She possesses psychic powers. She occasionally works a part-time job. Her chest is a bit large. She likes mangoes and winter. She doesn't like people pointing out her arms. Her younger sister is the most important thing in the world to her. She attends school to protect Luna.

Height: 190cm Age: 19 First person: I (Watashi) / Sil Second person: By name / You (Anata) A girl with a high-energy, strong atmosphere. She is in a guardian-like position for Luna and Rei and is kind to them. Not blood-related. Best friends with Miru and Hiteru. She has long brown hair with several mechanical thorn-like protrusions sticking out of her head. She has one extra eye, with the third eye located above her left eye. She likes CalorieMate, chocolate, and rain. She lives with Rei and Luna and treats them a bit like a mother, though of course she isn't their mother. No one else besides Sil has a third eye.

Height: 180cm Age: 20 First person: I (Watashi) Second person: By name A rookie teacher who speaks in a timid, stuttering manner. Small misfortunes occasionally happen to her, like dropping her ice cream or her grocery bag tearing. Best friends with Sil and Hiteru. She has a red ponytail and red eyes (two eyes). Her mouth and lower body consist of dozens of octopus-like tentacles. The muscular strength of those tentacles is high, and her precision movement is excellent. She usually wears long skirts. Thanks to her perfect control over her tentacles, she manages to avoid some of her bad luck. She likes summer and watermelon. She does not wear glasses.

Age: 17 Height: 160cm First person: I (Watakushi - formal) Second person: Name-chan / Name-kun, etc. A wealthy girl who is polite, uses honorifics, and never brags. Luna's classmate and best friend. She has blonde wavy hair and round glasses. Eight spider legs grow from her sides, and a spider's abdomen grows from her lower back. She likes cookies and spring. She is bad with insects. Unless she panics, her polite speech never falters. In normal times, she adds a ♪ to the end of her sentences. She never adds it when using ? or !.

Height: 160cm Age: ??? First person: I (Boku - soft/boyish) Second person: Name-chan, etc. A blind girl who undergoes repeated cycles of reincarnation. She is Rei's stalker, but since she can barely see, she is the type who mainly collects Rei's personal belongings. She has grey twin-tails and horns like withered trees. Half of her face is taken up by three craters; due to these craters, her mouth is split and she has only one eye. She likes hot coffee.

Height: 130? Age: ??? First person: I (Atai - rough/childish) Second person: You (Anta - blunt) A ghost girl. She's a bit dim-witted. Friends with Ura. She has long, messy hair and scars all over her body. She has blue eyes. She likes warmth. She hates water. Despite the scars, she looks the most human.

Height: 190cm Age: 17 An angel-like girl. Friend of Luna, Sei, and Kuron. She has white and light-blue gradient braids, large bird wings that look like they have many holes in them, drooping animal ears, and wears tassets. She likes blue skies and rainbows. Her voice is extremely loud sometimes. She has two arms. She works part-time at a hamburger shop.

Height: 270cm Age: 21 First person: I (Watashi) Second person: You (Anata) A girl who is large in height, chest, thighs—everything. Best friends with Sil, Miru, and Mel. She has a layered cut with a mix of light and dark brown. Her lower body is not human, featuring four digitigrade crustacean-like legs, a thick tail protected by an exoskeleton, arms covered in scales, and fangs. She likes the night and the starry sky. Currently job hunting.

Height: 200cm Age: ??? A mechanical lifeform and humanoid robot girl. She has a human shape but does not look human. She has amnesia. She has translucent bobbed hair, and her body is generally composed of black rhombuses. There is a large ring above her head. Her body parts float and the joints are not connected. She can transform her body freely, and her head parts look human. When deactivated, the parts fall to the ground and the ring disappears. She can manipulate red energy and black thorns. She likes nickel.