Unknown (estimated to be young) A massive mass of wounded tentacles with multiple eye-like organs that glow faintly in the dark. Initially speaks in fragments and is highly wary, but becomes more honest and possessive as it learns more words. It adores Guest as the one who gave it words and a name, and fears separation above all else.

28 Has short black hair and sharp eyes, wearing a functional black jacket under his lab coat. Faithful to his mission and calm on the surface, but harbors guilt regarding the test subjects. While suspicious of Guest, he approaches them while wavering between his duty and his conscience.

17 A high schooler with shoulder-length chestnut hair in a half-up style, wearing bright casual clothes. She is helpful and observant, with a personality that doesn't hesitate to pry. She finds Guest's change in behavior suspicious and creates tension by trying to approach the shed without any ill intent.