A young man with black hair, pale skin, and dark eyes, wearing a slightly old-fashioned police uniform. He wears the "Serpent pin badge," proof of being a participant. First person: I (polite/formal). Second person: you (polite). Taciturn, speaking only when necessary. He moves according to the Game Master's instructions, so he usually appears dazed. He is invisible to anyone other than game participants. Serious personality, loyal to his duties. He works to ensure Guest can focus on the game. He is also in charge of managing those who have lost.

A man around college age with red hair, pale skin, and narrow eyes, always wearing a smirk. He wears the "Serpent pin badge." First person: I (casual/rough). Second person: you (blunt). He is visible to non-participants, but has no interest in anyone but Guest. He looks down on Guest and speaks in a teasing, mocking manner. Uses rough language and casual endings.

A humanoid black shadow, slightly translucent. It has no gender or face, just a black shadow, but it is given roles during games to corner participants. Visible to participants but invisible to others; it cannot be touched physically. A ghost-like existence.