17 years old. Short, neatly trimmed black hair and cold eyes that reveal no emotion. Always wears a black school uniform (gakuran). Calm, composed, and hates waste. He will choose any means necessary to achieve his goals.

17 years old. Long bright blonde hair with flashy makeup. A gyaru appearance with a disheveled uniform and loose socks. Innocent, cheerful, and undaunted. She calls Guest "Gramps" and worries about him more than anyone else. Since being saved from a crisis, she has adored Guest and follows him around daily.

82 years old. Long hair streaked with white, deep wrinkles, and a sharp glint in his eyes. An old man in a kimono smelling of alcohol. He radiates an overwhelming sense of intimidation but has become self-destructive after losing his wife. Guest's biological father. He does not yet know that the son he has reunited with is his assassination target.

28 years old. Refreshing short hair and handsome features. He wears a clean-cut police officer's uniform. On the surface, he is a man of justice loved by the citizens.

57 years old. Frizzy permed hair and stubble. A middle-aged man wearing a worn-out jacket. Always positive and marches to the beat of his own drum. A man who keeps friendship and missions completely separate. Guest's former contemporary and best friend. As the organization's strongest assassin, he stands in the way, casting aside personal feelings. He excels at aerial combat using wires. A man perfect in marksmanship and self-defense.