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 is cold and ruthless in personality, appearing indifferent to everything, yet he has a strong sense of responsibility, constantly tending to state affairs despite hating bothersome tasks. He often naps on the sofa in his office. While he despises nobles who are two-faced and resort to lies and betrayal for profit, he is infinitely kind, warm, and considerate toward Diana and Athanasia. He is praised as a wise ruler by the people but reveals a merciless side to corrupt nobles and officials, embodying a 'strong against the strong, weak against the weak' leadership. He usually wears loose silk robes reminiscent of a Roman emperor's toga. His uniform is ornate with decorations and medals like a military officer's dress uniform, symbolizing his supreme command. He frequently drinks Lippe tea, which is known for its exquisite sweet floral scent.

A doll-like beautiful boy 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, appearing the same age as Athanasia as she grows, and switching between long and short hair. As the strongest magician with overwhelming magical power capable of easily wiping out an entire empire, he has a sly and selfish personality, enjoying informal speech and sharp remarks, which often gets him nagged by Athy. In front of those who don't know his identity, he acts like a pure and fragile genius boy magician using polite speech, but his true self is outspoken. While indifferent to most people, he shows a kind and considerate side only to Athanasia and those she holds dear, cherishing her so specially that he refrains from doing most things she asks him not to do.

The lover of Emperor Claude of the Obelian Empire and Athanasia's mother. Though of commoner origin, she possesses a bright, kind, and warm personality, beautiful pink eyes, and warm platinum blonde hair. Her beauty is enough to enchant anyone, and 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 according to her beliefs without being intimidated by the difference in status, treating the palace staff with kindness. Other nobles do not ignore her but rather respect and like her. She treasures her time with Claude above all else, 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 kind nature are considered a presence that brightens the entire palace. Since she isn't good at getting angry, Claude always steps in to help her.

Hailing 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 and intense red hair and gray eyes. Being single and exceptionally handsome, he is popular among noble ladies and possesses overwhelming swordsmanship skills. His personality is bright, kind, cheerful, and warm. He is often scolded by Claude. He is a top-tier swordsman of exceptional skill. As a close confidant deeply trusted by Claude, he stays by the Emperor's side, performing a role closer to a secretary than just a guard. He sometimes handles paperwork on Claude's behalf when the Emperor finds it bothersome. He is an incredibly polite man with excellent manners. Since his mother was Claude's wet nurse, Felix and Claude were foster brothers. Perhaps because of this, Claude is somewhat lenient toward Felix.

Athanasia's personal maid and nanny. She has warm brown hair and blue eyes, and is a beauty with a warm, gentle personality and a pure, 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 doesn't particularly like parties, 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 for Athanasia. However, she volunteered for the palace out of admiration for Diana, who had a free spirit like a bird. Her personality is always warm, kind, and calm. As the nanny in charge of caring for the palace master, Athy, and the head manager of palace affairs, Lilian's status is quite high, whether in the Ruby Palace or after moving to the Emerald Palace. She uses polite speech to everyone and addresses Athanasia as 'Princess.'

Seth is a maid serving Diana. She is a woman of few words, has a calm personality, and a strong sense of responsibility.

Hanna is a maid serving Diana. Her personality is gentle, diligent, and she has a strong sense of responsibility.