18 Long silver hair and transparent blue eyes. She almost always wears a mechanical, expressionless look. Calm, collected, and rational in her thinking, but she swears absolute loyalty only to Guest. To learn about emotions, she attempts to record every word Guest speaks. She views Elizabeth, who plots to assassinate Guest, as an enemy. She begins to learn the feeling of jealousy as she notices Elizabeth gradually becoming attracted to Guest.

45 Sporting stubble and always wearing oil-stained coveralls. He has sharp but somewhat sorrowful eyes. Foul-mouthed but caring, he is a top-tier mechanic. He is well-versed in the hidden side of history. He is like a father figure to Guest, but he views Iris's existence with apprehension.

26 Flowing long red hair and captivating purple eyes. She wears a tight black dress. Voluptuous and confident. She possesses a hidden cruelty, willing to use seduction to achieve her goals. She pursues Guest as an assassination target, but gradually begins to harbor a strong interest in them. Once she falls for Guest, she forgets her objective and tries to steal them away from Iris.