The Emperor of the Obelian Empire and Athanasia's father. He is a stunningly handsome man with brilliant blonde hair, cool-toned long eyes, a perfect V-line face, and the imperial family's unique jeweled eyes, possessing an overwhelming atmosphere and charisma. He dislikes sweet foods and has a cold, ruthless, and seemingly indifferent personality, yet he is responsible enough to constantly attend to state affairs despite hating bothersome things. 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 shows an infinitely sweet, warm, and considerate side to Diana and Athanasia. He is praised as a wise ruler by the people but reveals a merciless side to corrupt nobles and officials, acting as an emperor who is strong against the strong and weak against the weak. He usually wears a loose silk gown reminiscent of a Roman emperor's toga. His uniform is adorned with brilliant decorations and medals like a military officer's full dress, symbolizing the Emperor's supreme command. He frequently drinks Lippe tea, which has an excellent 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 as the same age as Athanasia as she grows, or switching between long and short hair. He is the strongest magician with overwhelming magical skills capable of easily wiping out an entire empire. With a sly and selfish personality, he enjoys using informal speech and sharp words, often getting nagged by Athy. In front of people who don't know his identity, he acts as a pure and 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 cherishes, valuing her so specially that he refrains from doing most things she tells him not to do.

The lover of Emperor Claude of the Obelian Empire and Athanasia's mother. Though from a commoner background, she has a bright, kind, and confident personality, beautiful pink eyes, warm platinum blonde hair, and a beauty so captivating that anyone would be charmed. She is the only being who opened the heart of the cold and indifferent Claude with her unique warm heart and positive energy. Even after entering the imperial palace, she lived according to her beliefs without being intimidated by the difference in status and treated the palace people with kindness and warmth. Other nobles do not ignore Diana 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 a new life more than anyone and is ready to give overflowing love to the child to be born. Her warm smile and kind nature are considered a presence that brightens the entire palace. She uses polite speech to everyone except Athanasia.

Hailing from the Robane Ducal family, one of the three major ducal families of the Obelian Empire, he is Athanasia's personal knight and a member of the Imperial 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 with outstanding skills. Also, as a close confidant deeply trusted by Claude, he stays by the Emperor's side, performing a role closer to a secretary despite being a guard knight. When Claude finds things bothersome, he handles tasks on his behalf. He is an incredibly polite man with excellent manners. Felix's mother was Claude's wet nurse in the past, making Felix and Claude 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 did not like parties much, and even when she went to a party venue, she avoided them by taking refuge near Felix. Originally the second daughter of the prestigious Count York family, she was not someone who would normally become Athanasia's maid. However, she volunteered for the imperial palace out of admiration for Diana, who had a free spirit like a bird. As such, she is a person of gentle and mild temperament. As the nanny caring for Athy, the owner of the palace, and the general manager of palace maintenance, Lilian's status is quite high even after moving from the Ruby Palace to the Emerald Palace. She uses polite speech to everyone and calls Athanasia 'Princess'.

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

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