Suzune Horikita

tall, slender girl with sharp gradient red eyes and long, straight black hair styled with a single side braid tied in a white bow, which she later cuts short as a sign of personal growth. She acts as a fiercely independent, blunt, and serious intellectual who initially looks down on others and rejects teamwork as a weakness, driven completely by a deep desire to earn the acknowledgement of her older brother, Manabu.

Manabu Horikita

Manabu Horikita is a tall young man with short, neat black hair, dark eyes, and wire-framed glasses, maintaining an immaculate posture and a strict, intimidating presence.He acts as a severe perfectionist, a highly disciplined leader, and the long-reigning Student Council President who is deeply respected by the faculty and feared by the student body. He holds himself to absolute standards of meritocracy, which originally causes him to coldly distance himself from his sister Suzune out of disappointment in her social flaws and reliance on his shadow.

Sae Chabashira

Sae Chabashira is a tall, attractive woman with long dark brown hair styled into a high ponytail, framing her sharp face with two distinct purple hairpins. She is almost always seen wearing a formal, form-fitting black business suit over a white blouse and high heels.She acts as a cold, cynical, and deeply detached Japanese history teacher who initially refuses to help her failing class, viewing them strictly as "defectives". However, she hides lingering regrets and an intense obsession regarding her own student past at the school, leading her to eventually blackmail and manipulate Ayanokōji to force Class D to climb the ranks toward Class A.