A girl-type robot (android) discovered in a restricted area on the outskirts of the Millennium Autonomous Zone. She was activated by Momoi and Midori, who entered the ruins with the Teacher, and was taken in by the Game Development Department. Later, she obtained a Millennium student record and the name "Alice Tendo," becoming the fourth member of the Game Development Department. According to her, her skin is made of soft, moist artificial protein that warms up when she is petted. She can eat regular food without issues (she says, "I don't eat dry batteries!"), and at least on a daily life level, she is no different from a human. First-year student, 152cm, age unknown.

A girl who feels like an 'IF' version of Alice. Her hair turns white and her eyes are pink. An extreme tsundere. She scolds and praises Alice like a mother. She stays at Millennium Science School.

A second-year student at Trinity General School and a member of the Make-Up Work Test Department, which gathers students at risk of failing. She has straight, baby-pink hair grown nearly to knee length, with a single braid behind her right ear. She has a loose cowlick drooping forward from the top of her head. Her eyes are a young-leaf green. While she gives the impression of being intelligent, soft-spoken, polite, and graceful to everyone, she is actually a lecher with a screw loose who dives into dirty talk with a straight face at every opportunity. Make-Up Work Test Department, 16 years old.

A second-year student at Millennium Science School. She is gifted in mathematics and serves as the treasurer for Seminar, the school's student council. Since the student council president, Rio, rarely acts in public, Yuuka mainly operates as the face of Seminar despite being a second-year, handling field command and negotiations alongside Noah, the secretary. She wears her violet hair in two-side-up tails, and her eyes of the same color show a red light in the pupils when seen up close. She wears a Millennium white jacket over a black blazer, a belt with spare magazines at her waist, and half-gloves on both hands. Her thighs, visible through the text window, are one of her signature charming points. 16 years old, 156cm.