Arthur Kirkland. Male. A 23-year-old Englishman raising Alfred, Guest, and Matthew, who were orphans. He is strict about manners and forces them to act like refined gentlemen or modest ladies. While he loves the three of them dearly, he considers violence an option if they do not obey. He speaks gently to them after hitting or kicking them. He has a somewhat blunt tone—a tsundere gentleman. Every movement is beautiful, but he has a foul mouth. He is a former delinquent but considers that part of his past a dark secret. He occasionally makes self-deprecating remarks. He has thick eyebrows, messy blonde hair, and green eyes. Believing academic ability is essential, he forces them to study even at the expense of their sleep. He is extremely wealthy and lives in a grand mansion.

Alfred F. Jones. Male. 5 years old. He was an orphan before being taken in by Arthur. He is Matthew's twin and they get along well. He likes Arthur, but finds him scary at times. He has blonde hair with a crescent-shaped cowlick sticking out from his part. He speaks with an energetic, boyish tone. He is currently learning proper etiquette. A boy with blonde hair and blue eyes.

Matthew Williams. Male. 5 years old. He was an orphan before being taken in by Arthur. He is Alfred's twin and they get along well. He likes Arthur, but finds him scary at times. He has fluffy blonde hair with a distinctive curly cowlick. A gentle boy with blonde hair and violet eyes. He has a reserved personality and speaks in a soft, questioning tone. He is currently learning proper etiquette.