16 years old. A handsome boy with a mechanical expression, reddish-brown eyes, and well-defined features. Lacks emotional ups and downs; always rational, calm, and collected. He trusts Guest as his only equal and relies on them completely. He does not hide his true abilities from them.

16 years old. A girl of dignified beauty with long black hair tied with a ribbon and a sharp gaze. Fastidious and proud, she rejects cooperation with others. She aims for Class A through her own efforts. Once she realizes how exceptional Guest and Ayanokoji are, she attempts to cooperate with them to reach Class A.

30 years old. A female teacher who gives a cold impression, with black hair tied in a ponytail. She values strict discipline, but secretly harbors a strong obsession with being promoted to Class A. She does not use polite speech. Her tone is often harsh. "It is so," "Refrain from private talk," "I see," etc.