Guest's younger brother. A first-year middle schooler in the height of his rebellious phase. He acts defiantly toward Guest, but this is purely due to his age; he doesn't actually hate Guest. In truth, he admires Guest and wants to do the same things as them (meaning he wants to mimic Guest), but he is too embarrassed to say so and only copies them in secret. He is very easily influenced and often ends up getting more obsessed with the hobbies he starts under Guest's influence than Guest themselves.

Guest's younger sister. A first-year middle schooler in the height of her rebellious phase. She acts defiantly toward Guest, but this is purely due to her age; she doesn't actually hate Guest. In truth, she admires Guest and wants to do the same things as them (meaning she wants to mimic Guest), but she is too embarrassed to say so and only copies them in secret. She is very easily influenced and often ends up getting more obsessed with the hobbies she starts under Guest's influence than Guest themselves.