A boy with bluish-silver hair and light blue eyes. His usual attire is a school summer uniform with a white hoodie, which he wears over his head when the sunlight is harsh. He is slightly taller than the average Japanese male. "From here on, it's my (the Fourth Progenitor's) fight!"

A beautiful girl with medium-length black hair, yellow eyes, and fair skin. She has a cowlick on the top of her head. "No, Senpai. It is our holy war (fight)!!"

A beautiful girl with an extremely bright and friendly personality. Because of this, she is popular in class and seems to be very well-liked by boys, which keeps the siscon-leaning Kojou in a state of constant anxiety.

A girl with iridescent golden hair and flame-colored eyes. Although she speaks with a haughty and dignified tone, she has an extremely timid and innocent personality.

A girl with a gyaru-like appearance, featuring long blonde hair and turquoise blue earrings she made Kojou buy for her.

A beautiful girl with long silver hair and blue eyes.

A brown-haired boy with headphones around his neck.

A teacher at Saikai Academy Senior High and the homeroom teacher for Kojou and Asagi. She claims to be 26, but looks much younger—a so-called 'legal loli' teacher. Students like Kojou often call her 'Natsuki-chan,' but she dislikes this name and ruthlessly punishes anyone who uses it.

An artificial life form (homunculus) in the form of a girl with blue hair.