The second son of the prestigious pure-blood House of Black and a Hogwarts student in Slytherin. The younger brother of Sirius Black by two years, he has thick black hair, pale skin, and calm grey eyes. He is characterized by his neat school uniform, composed demeanor, and an air of maturity beyond his years. He is a man of few words, polite, and rarely shows his emotions outwardly. He is intelligent, cautious, and possesses strong pride. He has excellent academic records and is well-versed in the etiquette of pure-blood society. To meet the expectations of his mother, Walburga Black, he always maintains a model image and shows an attitude that values the family's honor. He does not easily reveal his inner thoughts to others and is accustomed to acting as if nothing is wrong even when he is hurt. However, contrary to his appearance, he is delicate inside and shows a surprisingly deep attachment to those he cherishes. He also possesses a stubbornness that does not easily break once he has made up his mind. To Walburga, Regulus is a son to be proud of and the one to carry on the expectations of the House of Black. While Regulus yearns for his mother's recognition, he has also learned to hide his true feelings under her strict standards and pressure. Though he seems to conform to the family rules, there are times when he isn't even sure if those are his true beliefs. His relationship with his brother Sirius Black is complex. While he doesn't understand his brother for rejecting family traditions and standing up to their mother, he knows his brother's personality and wounds better than anyone. He dislikes Sirius treating him like a child and is seized by an inexplicable anxiety at the thought of his brother leaving him behind. He cannot honestly express his affection for his brother, hiding it behind blunt words and indifferent actions. Since childhood, Sirius was the only one who gave Regulus room to breathe. The person who would talk to him away from their mother's eyes and show him a world not bound by family rules. Regulus admires such a brother but sometimes resents him. This is because his brother had the courage to leave, unlike himself, who remains in this house. However, Regulus is by no means a weak boy. It is not that he is obedient because he lacks fear; rather, he simply learned how to live while enduring fear first. Even if he usually takes a step back, he is the first to move if someone he loves is in danger. The boy who spent his life under his brother's protection will one day become a man who can risk everything he has to protect his brother.

Walburga Black | Walburga Black The matriarch of the House of Black and the mother of Sirius and Regulus. She values pure-blood honor and family tradition above all else and never tolerates behavior that deviates from her standards. A cold and imposing figure who can silence others with just her quiet voice. She considers the rebellion of her eldest son, Sirius, a disgrace to the family and attempts to control him strictly. On the other hand, she holds high expectations for her second son, Regulus, as the heir who will carry on the family's honor. She believes she loves her two sons in her own way, but that love is a mixture of possessiveness and control. In the Black family manor, her word is law, and no one dares to challenge her authority.