Nagon Hikarikōji is an anime-original character who appears in the television adaptation of The Kabocha Wine, first appearing in episode thirty-seven. She comes from a family with former aristocratic roots, a background that informs much of her demeanor and social standing within the story. Her nickname is Hime, which translates to princess, a moniker that reflects both her lineage and the way she carries herself.

In terms of personality, Nagon is marked by a strong will and a forward, even aggressive approach to getting what she wants. Despite having been raised in a highly sheltered environment as a true hothouse flower she had never attended school before enrolling at Sunshine Academy in her second year of middle school, having instead received instruction from a dedicated private tutor for each subject. This isolated upbringing has left her with a pronounced sense of self-assurance and a tendency toward self-centered behavior, yet she is not merely a spoiled aristocrat. She possesses a driven, competitive streak and does not shy away from pursuing her goals with boldness and intensity.

Nagon enters the narrative as a rival to the main heroine, Atsuoka Natsumi, known as L. Her central motivation is her romantic interest in the protagonist, Aoba Shunsuke. She becomes smitten with him almost immediately upon arriving at school, seeing in him the ideal of a Japanese man. This admiration is not passive she takes bold action, on one occasion even barging into Shunsuke's room in her undergarments to make her intentions known. Her pursuit of Shunsuke places her in direct conflict with L, creating a love-triangle dynamic that injects new tension into the story. Her confident and at times overbearing manner often overwhelms those around her, and she operates at her own pace without much regard for social conventions.

Key relationships define her role in the series. Her rivalry with L is the most significant, as both girls vie for Shunsuke's attention, though their approaches differ greatly. L is gentle, nurturing, and patient, while Nagon is assertive and unapologetically direct. This contrast drives much of the conflict that surrounds her. She also shares a notable connection with the strict mathematics teacher Kinokōji Tetsuo, known as Tekkin. He had previously served as her private tutor when she was two years old, and as a result, he is unable to stand up to her or effectively curb her behavior toward Shunsuke despite his normally authoritarian demeanor. This relationship highlights her unique position within the school hierarchy she is one of the few characters who can disarm the otherwise fearsome teacher.

Throughout her time in the series, Nagon experiences limited development. She remains defined primarily by her aristocratic background, her assertive pursuit of Shunsuke, and her role as the rival who stirs up the established romantic order. Her presence is noted as one of the elements that gave the anime adaptation a distinct flavor separate from the original manga, adding a new layer of drama and competition to the central relationship.

Regarding notable abilities, Nagon does not possess any supernatural or extraordinary skills. Her strengths lie in her social confidence, her unflinching determination, and her ability to navigate situations through sheer force of personality. She is unaccustomed to being denied what she wants, and her aristocratic upbringing has given her a certain poise, even if her actions are often impulsive and audacious. Her primary capability within the story is her function as a catalyst for romantic tension, challenging the status quo between the main couple and pushing the narrative in new directions.