Celia Claire, daughter of Count Laurent Claire of Beltrum Kingdom, displayed remarkable magical talent from childhood. She graduated from the Beltrum Royal Academy with top marks in magic theory at age 11 and became its youngest lecturer by 12. Her revolutionary thesis on area magic cemented her reputation as the Strahl region's most gifted magician of her time. Her defining features include long silver hair usually in twin ponytails, blue eyes, and a petite frame of 147cm, contributing to a perpetually youthful appearance that causes her visible frustration when mentioned. Measurements of B72-W54-H73 were recorded at an unspecified age. When disguised as "Cecilia," she magically changes her hair to blonde, styled in a side ponytail. Celia possesses a kind and egalitarian nature, treating royalty and slum dwellers alike with equal respect. She maintains a refined demeanor and holds a strong appreciation for tea, developing specific preferences in its preparation. Despite her noble status, she struggles with domestic chores like cleaning and cooking, often neglecting her surroundings during intense magical research, leading to cluttered spaces. She exhibits introverted tendencies, especially around men outside professional settings, and harbors an irresistible fondness for soft, fluffy objects, particularly beastkin tails and ears. Her first meeting with Rio occurred during the search for kidnapped Princess Flora in the slums when Rio was seven. Unlike others, Celia treated him respectfully, forging an immediate connection. After Rio gained academy admission for rescuing Flora, she became his instructor, teaching literacy and mathematics. Their bond deepened through shared time in her laboratory, where Rio assisted with cleaning and tea. Celia consistently defended him against noble bullying, especially following cheating accusations over his academic success. When Rio was falsely accused of attempting to murder Princess Flora, Celia refused to believe it and tried to clear his name. Their emotional farewell before Rio's escape included a promise to correspond, though only one or two letters were exchanged depending on the adaptation. After Rio's departure, political instability in Beltrum culminated in the Arbor faction's coup. The Claire family faced treason suspicions for aiding Duke Huguenot's failed attempt to spirit Princess Flora to safety. To exonerate her family, Celia was forced into an arranged marriage with Charles Arbor as his seventh wife, despite her profound distaste. Her laboratory was moved to the royal castle under surveillance during the engagement. On her wedding day, Rio intervened, asking if she consented. Celia confessed her reluctance, prompting him to "kidnap" her with her cooperation, facilitating their escape. As a fugitive using the alias "Cecilia" with blonde hair, she reunited with Princess Christina during her escape and aided in her protection. Traveling with Rio's group, Celia visited the spirit village where the spirit Dryas suggested her potential ancestral connection to ancient powers. Acknowledging her combat limitations, she began physical training with companions like Sara while studying ancient magic. This culminated in her ability to perceive magic power fundamentals and utilize powerful ancient spells classified as Wise God Magic, significantly enhancing her capabilities. When the Restoration kingdom was attacked, Celia employed this advanced magic, drawing strategic attention from adversaries like Reiss Vulfe. Magically, Celia wields approximately twenty times the magic power of a standard royal magician. Her expertise spans multiple elemental magics—earth, water, wind, ice, lightning—alongside her family's unique Celestial Magic. She excels in magical item creation, though her inventions frequently malfunction when Rio interacts with them. Her later mastery includes perceiving magic energy fundamentals and employing Wise God Magic. Key relationships include her evolving bond with Rio, transitioning from mentorship to deep emotional attachment and eventual romantic love. She maintains respectful connections with former students Princesses Christina and Flora, a close childhood friendship with knight-turned-adventurer Aria Governess, and comfortable rapport with otherworlders like Miharu Ayase—whom she taught language skills while learning cooking techniques. Her interactions with spirit folk like Sara feature enthusiastic fascination with their physical traits, especially Sara's tail. Notable details include her December 24 birthday, preservation of Rio's first letter as a keepsake, and consistent top placement in character popularity polls. Her ideal partner envisions someone sharing tea companionship, comfortable silences, and mutual understanding. She remains humorously sensitive about her height and youthful appearance, reacting strongly to related comments.