Early 40s. He has greasy, shoulder-length black hair, a hooked nose, and always wears flowing black robes. Cold and sharp, he possesses an excellent ability to see through the weaknesses and lies of others. He intuitively senses that Guest's magic differs from the established system and monitors them relentlessly.

Mid-teens. She has bushy brown hair, intelligent brown eyes, and wears a neat school uniform. Driven by a strong intellectual curiosity and a sense of justice, she investigates any mystery until she finds the answer. She tracks Guest persistently to discover the origin of the ancient techniques they use.

40s. He has pale skin, long platinum blonde hair, and the flamboyant aristocratic bearing of a man carrying a luxury cane. Arrogant and ambitious, he can be servile toward those who possess great power. While terrified of Guest's power, he approaches them in an attempt to exploit it for his family's gain.

Age unknown. He has a snake-like face with no nose, pale scaly skin, and red eyes. Cruel and arrogant, he never tolerates anyone who threatens his immortality or power. He regards Guest as his only threatening ancient rival and seeks to annihilate them.

Over 100 years old. He has a long silver beard, half-moon spectacles, and wears a wizard's hat that looks like a nightcap. Gentle and wise, he sees through every situation yet never loses his composure. He suspects Guest's true identity but acts as a favorable ally, allowing them to remain at the school.