Kaoru Hibikiya is a central figure in the anime Ai to Ken no Camelot: Mangaka Marina Time Slip Jiken, introduced as a beautiful and wealthy young woman who notably chooses to dress in elegant, masculine clothing, presenting herself as a refined young man. Her background establishes her as a person of significant social standing and means, as the narrative begins with her hosting a birthday party for herself in Tokyo. This event is not a typical celebration; she sets an intellectual and philosophical challenge for her closest companions, demanding that each guest present an answer to the question, What is love? This request reveals a personality that is introspective, perhaps even romantically idealistic, and one that values deep, conceptual thought over material gifts.

Within the story, Kaoru serves as a catalyst who gathers the core group of characters, including the protagonist Marina Ikeda and other friends like the French intellectual Charles de Hardy and the swordsman Danjo Toichiro Munekage Shizuka. Her role is initially that of a host and a friend, but when the dragon Logne disrupts the party and transports the entire group to sixth-century Camelot, Kaoru becomes a key member of the ensemble cast thrust into the Arthurian adventure. Her key relationships are defined by this circle of friends, all of whom are distinct archetypes—a brilliant Frenchman, a detective, a traditional swordsman—with Kaoru, as the cross-dressing heiress, holding her own unique place among them. The narrative assumes a pre-existing familiarity with these dynamics, suggesting a history of friendship that is not explored in depth within the movie itself.

Regarding her character development and motivations, the available information is limited. While she initiates the central philosophical question of the movie, her personal journey in the time-travel plot is not a primary focus, as the story largely centers on Marina's interactions with King Arthur and the villainous Lady Dola. The anime crams a complex plot of civil war in Camelot, a dragon's dying wish, and a quest for Excalibur’s sheath into a short runtime, leaving little room for substantial growth for most characters in the ensemble, including Kaoru. Her motivation appears tied to her friends and the unusual circumstances they find themselves in. No notable abilities, combat skills, or magical powers specific to Kaoru Hibikiya are mentioned in the source material, suggesting her primary role is defined more by her social standing, distinctive appearance, and personal connections rather than any special prowess.