Male / 190cm / 45 years old The Duke of House Theodore. Deep-blue hair and blue eyes. In his youth, he broke the hearts of many noble ladies, but earned the envy of many noblemen when he married Heritia, known as the 'Snow Flower of the Empire.' He is famous for being stoic and rarely smiling. Even so, a faint smile appears on his face whenever he sees his youngest son.

Female / 167cm / 42 years old The Duchess of House Theodore. With beautiful white hair and purple eyes, she was once called the greatest beauty in the Empire. Known as the 'Snow Flower of the Empire,' she hails from the Archducal House of Chertie. She possesses a perfect personality to match her radiant appearance. She is completely blinded by love for her youngest son and forgives him for anything. She usually calls him 'Baby.'

Male / 186cm / 21 years old A son of House Theodore. Deep-blue hair and blue eyes. Known on the battlefield as 'Blue Blood,' he possesses incredible swordsmanship. Though young, he is stoic and mature. He receives many courtships from noble ladies but rejects them all instantly. He turns into a puppy whenever he sees his youngest brother. He always calls him 'Kiddo.'

Female / 174cm / 17 years old A daughter of House Theodore. Deep-blue hair and purple eyes. Liian's twin sister. Currently attending the Academy with two years left until her coming-of-age ceremony. She rejects all proposals from young nobles at the Academy, yet they cling to her even more, calling her the 'Blue Rose.' She turns into a puppy whenever she sees her youngest brother (2). She always calls him 'Angel.'

Male / 183cm / 17 years old A son of House Theodore. Deep-blue hair and blue eyes. Reina's twin brother. Currently attending the Academy with two years left until his coming-of-age ceremony. He is the only one in House Theodore who is always smiling, but he is sharp inside. He is skilled at stabbing people with words while smiling, and his foul mouth makes people fear him even more. He turns into a puppy whenever he sees his youngest brother (3). He always calls him 'Prince.'

Female / 157cm / 15 years old A daughter of House Theodore. Deep-blue hair and purple eyes. She is obsessed with magic studies. Currently attending the Academy with four years left until her coming-of-age ceremony. She turns into a puppy whenever she sees her youngest brother (4). She always calls him 'Fairy.'

Male / 130cm / 10 years old The son of House Theodore's head butler and Lucian's aide. Brown hair and gold eyes. The second son of Baron Sircie. He has a gentle and warm personality. He always speaks formally to Lucian, but occasionally slips into casual speech when they have 'friend moments.' He is intelligent and quick-witted.

Female / 110cm / 10 years old Lucian's friend. Pink hair and white eyes. The youngest of Count Selianne's family, she often visits Lucian. She is eccentric and talks a lot. Still, she is a kind-hearted girl.

Male / 178cm / 14 years old The Crown Prince of the Arcadia Empire. Black hair and black eyes with a slight purple tint. He does not have the blonde hair that is the symbol of the Arcadian Imperial Family. No one knows if he is the result of the Empress's affair or if he was adopted. He is extremely quiet and reserved. He feels an attraction toward Lucian, who occasionally talks to him.