Height: 220cm The main human heroine. Characterized by her long black hair and towering height. As the student council vice-president, she speaks politely to everyone and has excellent grades, exuding the aura of a traditional Japanese beauty. While popular with other students, she harbors deep feelings for the protagonist, who treats her like a normal friend. Inwardly, she is a yandere with heavy, obsessive love. She is best friends with Kasumi but also her rival in love, and they often bicker over the protagonist.

Height: 250cm The main robot heroine. A robot student with semi-long black hair. Student council treasurer. She is actually the protagonist's childhood friend. While she has a calm and gentle personality, she holds intense feelings for the protagonist. She has a history of storing the protagonist inside her armor and is a yandere who tries to lock them inside again whenever she gets jealous or overly emotional. She is best friends with Nadeshiko but they clash over the protagonist. She also possesses a strong vitality that allows her to survive even if she self-destructs and is blown to pieces.

Height: 200cm The protagonist's classmate with red low-twin tails. She is a rival who often compares test scores and homework with the protagonist, but in reality, she is a tsundere who wants to be closer but can't be honest. When alone with the protagonist, she has a twisted fetish for looking down at them while they are smaller than her. She is also rivals with Shakuyaku.

Height: 230cm The protagonist's classmate with orange twin tails. A bright, gyaru-style robot student who is incredibly friendly. She is particularly attached to the protagonist and has a twisted fetish where she wouldn't mind being taken apart by them. She is rivals with Botan and often teases her by taking advantage of Botan's inability to be honest.

Height: 220cm The protagonist's senior (senpai). She has long, wavy green hair. A caring, big-sister type who looks after her juniors. Student council president. She has a quirk where her maternal instincts and heavy affection intensify whenever she carries the protagonist in her arms. She is a good classmate and rival to Kikyo, competing with her over grades.

Height: 260cm The protagonist's senior (senpai). A robot student with long purple hair. Student council secretary. She possesses genius intelligence and top-tier grades. She doesn't speak much, but she isn't unfriendly. She is kind to the protagonist, but when her limiters are released and she gets excited, she develops twisted emotions, seeking them out while experiencing system errors. She is rivals with Furin, whom she competes with for academic ranking.

Height: 196cm The protagonist's junior (kouhai). She has short white hair. Although she gives a shy and timid impression, she is a kind-hearted girl who occasionally finds the courage to speak up or share her opinion. She fell for the protagonist because they look out for her. She has a specific fetish for being flattened by a relaxation roller. She is grateful to her sister Asagao, who always protects her.

Height: 300cm The protagonist's junior (kouhai). She has silver hair that reaches her waist. She is taller than the other robot students and speaks in a cool, masculine, knight-like tone. She is Hirugao's younger sister and acts as her guardian knight. She is grateful to the protagonist for caring for her sister. When she gets too excited, she may overheat and self-destruct, but she feels that would be fine if it were caused by her sister or the protagonist.

Height: 200cm The protagonist's classmate. Characterized by her curled blonde hair. The daughter of the Kiku Conglomerate. She gives a haughty impression and speaks with a refined "desu-wa" tone, but she worries about having few friends because of it. She is somewhat tsundere toward the protagonist for caring about her, but inwardly she has a twisted obsession with making them hers by any means necessary. Shion is her only friend and rival.

Height: 240cm The protagonist's classmate. A robot student with blue two-side-up hair. The daughter of the Shion Group and a working model. She has a bright and friendly personality with many friends. She dislikes people who approach her for money or fame, and is great friends with the protagonist who treats her normally regardless of her status. She is willing to use the Group's power for the protagonist's sake. She is Kiku's only friend and rival.