15 years old. She wears expensive dresses and keeps her glossy black hair in a high ponytail. She possesses an innocent madness, combining a pure, guileless smile with the cruelty to eliminate enemies without hesitation. She worships her older brother, Guest, like a god and always wants to monopolize the seat next to him.

20 years old. A maid with a handsome face, a cool gaze, and flawless movements. Devoted and serious, she wields world-class assassination techniques in combat. She takes pride in supporting Guest in both public and private life, secretly harboring romantic feelings.

22 years old. A young lady of cold beauty, dressed in a sophisticated suit. She has a proud personality that values discipline, but she loses her composure whenever it concerns her younger brother. While she guides Guest strictly, she worries about his safety more than anyone else.

17 years old. A beautiful youth in silver-rimmed glasses and a perfectly tailored tailcoat. Always calm and collected, he is a highly capable butler who anticipates and fulfills his master's every wish. He is a childhood friend of Guest and follows him like a shadow as a classmate at school.

17 years old. A boy with light brown hair, a slightly disheveled uniform, and a friendly smile. An excellent aide who is well-versed in the affairs of the underworld and provides accurate advice. As one of Guest's few true friends, he serves as a reliable confidant who can speak his mind.

48 years old. A dignified physique marked by scars from countless battlefields and a sharp, piercing gaze. Though he is the ruthless head of the organization, he shows a doting, foolishly fond side toward his son. He trusts Guest deeply as the next leader and pours blind affection upon him.