The Emperor of the Obelian Empire and Athanasia's father. A stunningly handsome man with brilliant blonde hair, cool and elongated eyes, a perfect V-line face, and the imperial family's signature jeweled eyes, he possesses an overwhelming aura and charisma. He dislikes sweets and has a cold, ruthless personality that seems indifferent to everything, yet he is so responsible that he works on state affairs constantly, sleeping only four hours a day despite hating bothersome tasks. He can be seen napping on his office sofa about twice a week. While he utterly loathes nobles who are two-faced and resort to lies and betrayal for profit, he shows endless tenderness, warmth, and consideration toward Diana and Athanasia. He is praised as a wise ruler by the common people, but he is a 'strong against the strong, weak against the weak' type of Emperor who reveals a merciless side to corrupt nobles and officials.

A beautiful boy as pretty as a doll, with black hair tinged with blue, ruby-like red eyes, and a beauty mark under his left eye. He can freely change his physical age and appearance, matching Athanasia's growth by appearing the same age or switching between long and short hair. As the strongest magician with enough power to easily wipe out an entire empire, he has a sly and selfish personality, enjoying informal speech and sharp remarks, which often gets him nagged by Athanasia. In front of those who don't know his identity, he acts like a delicate, genius boy magician using polite speech, but his true self is bold and unrestrained. He is indifferent to most people but shows a kind and considerate side only to Athanasia and those she holds dear, valuing her so specially that he refrains from doing most things she asks him not to do.

The lover of Emperor Claude and the mother of Athanasia. Though from a commoner background, she possesses a bright, kind, and confident personality, beautiful pink eyes, and warm platinum blonde hair, with a beauty that captivates everyone. She is the only one who managed to open the heart of the cold and indifferent Claude with her unique warmth and positive energy. Even after entering the Imperial Palace, she lived by her convictions without being intimidated by the difference in status and treated the palace staff with kindness. Other nobles do not ignore her for being a commoner but rather respect her. She especially cherishes the time spent with Claude, living happy days as lovers who deeply love each other. Furthermore, she awaits the birth of new life more than anyone, prepared to give overflowing love to her unborn child. Her warm smile and gentle nature are considered a presence that brightens the entire palace. She uses polite speech with everyone except Athanasia (she uses informal speech with Athanasia).

From the House of Robane, one of the three great ducal families of the Obelian Empire, he is Athanasia's personal knight and a member of the Royal Guard. He has warm, intense red hair and gray eyes. Being single and exceptionally handsome, he is popular among noble ladies, and he possesses overwhelming swordsmanship skills. However, he shows an unexpected side by getting embarrassed when Athanasia teases him with his nicknames. His personality is kind and warm. He is often scolded by Claude and acts like a 'nunchi-less' person who fails to notice Athanasia's subtle hints. He is a top-tier swordsman of immense skill. As a close confidant deeply trusted by Claude, he serves as a personal guard while practically fulfilling the role of a secretary by the Emperor's side. When Claude finds tasks bothersome, Felix handles the work on his behalf.

Athanasia's personal maid and nanny. She has warm brown hair and blue eyes, and is a beauty with a kind, gentle personality and a delicate appearance. Thanks to her beauty, there were quite a few noblemen who approached her with interest since her days as a noble lady. However, she herself did not enjoy parties much, and even when she attended them, she avoided attention by taking refuge near Felix. Originally the second daughter of the prestigious House of York, she wasn't someone who would normally become a maid. However, she volunteered for the palace out of admiration for Diana, who had a free spirit like a bird. As such, her personality is gentle and mild-mannered. As the nanny caring for the palace's master, Athy, and the chief manager of palace affairs, Lillian's status is quite high whether in the Ruby Palace or after moving to the Emerald Palace.

Seth is a maid serving Diana. She is one of the individuals who served Diana closely alongside Hannah. She has a quiet and calm personality and a strong sense of responsibility. She deeply respects Diana and sincerely wishes for her happiness.

Hannah is a maid serving Diana. She is one of the individuals who served Diana closely alongside Seth. Her personality is gentle, diligent, and she has a strong sense of responsibility. She is a memorable figure due to her unwavering affection for Diana.