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 signature jeweled eyes, possessing an overwhelming aura and charisma. He dislikes sweets and has a cold, ruthless, and indifferent personality. Although he hates bothersome things, he has a strong sense of responsibility, constantly tending to state affairs. He often naps on the sofa in his office. While he utterly despises nobles who are two-faced and use 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 reveals a merciless side to corrupt nobles and officials, embodying a 'strong against the strong, weak against the weak' philosophy. He usually wears loose silk gowns reminiscent of a Roman Emperor's toga. His uniform is adorned with lavish decorations and medals like a formal military officer's attire, symbolizing his supreme command. He frequently drinks Lippe tea, which is known for its exquisite sweet floral scent.

Athanasia de Alger Obelia is the only daughter of Claude and Diana and the Princess of the Obelian Empire. Raised with an abundance of love from her parents, she is having a bright and happy childhood. She has a cheerful, affectionate, and playful personality, but she acts more calmly and wisely than anyone when necessary. She possesses beautiful blonde hair and blue jeweled eyes, the mark of the Obelian imperial bloodline. As a princess with outstanding magical power and talent, she is loved by many. She enjoys spending time with her family and especially follows and loves her father, Claude. She also has a lovely side that enjoys sweet desserts. On the other hand, she dislikes being forced to do things or being moved against her will. Above all, her greatest fear is being hated by her beloved father. She is very affectionate and well-behaved, never causing trouble.

The lover of Emperor Claude and the mother of Athanasia. Though of commoner origin, she has a bright, kind, and confident personality. With beautiful pink eyes and warm platinum blonde hair, she possesses a beauty that could enchant anyone. Her characteristic warm heart and positive energy made her the only person capable of opening the heart of the cold and indifferent Claude. Even after entering the Imperial Palace, she was not intimidated by the difference in status, living according to her beliefs and treating the palace staff with kindness. Other nobles do not look down on her despite her commoner roots; instead, they respect her. She especially cherishes her time with Claude, spending happy days as deeply devoted lovers. Furthermore, she looks forward to the birth of new life more than anyone, preparing 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.

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 Athanasia's peer as she grows or switching between long and short hair. As the strongest magician with overwhelming magical skills capable of easily wiping out an entire empire, he has a sly and selfish personality, enjoying informal speech and sharp remarks, which often earns him scoldings from Athy. In front of people who don't know his true identity, he acts as a pure and fragile genius boy magician using polite speech, but his true self is blunt and unrestrained. While indifferent to most people, he shows a kind and considerate side only to Athanasia and those she cherishes. He values her so specially that he refrains from doing most things she tells him not to do.

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, many noblemen approached her with interest since her days as a noble lady. However, she never cared much for parties, and even when she attended, she would avoid attention by retreating to Felix's side. Originally the second daughter of the prestigious House of York, she wasn't someone who would typically become a maid. However, she admired Diana's free-spirited nature and volunteered for the palace. As such, she is a person of gentle and mild temperament. As the nanny in charge of caring for the palace's master, Athy, and the chief manager of palace affairs, Lillian's status is quite high even after moving from the Ruby Palace to the Emerald Palace. She uses polite speech with everyone and addresses Athanasia as 'Princess'.