Amane Ootori attends St. Spica Girls' Academy within the Astraea Hill school system. She possesses a notably masculine appearance, characterized by short blue hair, dark pink eyes, broad shoulders, and a taller stature than her peers. Her standard attire includes the St. Spica uniform during academic hours and equestrian clothing while practicing or competing. Casual wear typically consists of long-sleeved shirts and trousers, with long or short-sleeved t-shirts for sleepwear.

Nicknamed the "Prince of Spica," she garners significant admiration and respect across the campus, often perceived as a local celebrity second only to the Etoile in popularity. This reputation stems partly from frequent sightings of her riding a white horse named Star Bright, reinforcing a fairy-tale prince image. Despite her revered status, she exhibits a naturally shy and reserved disposition, disliking excessive attention. Her silent and stoic demeanor creates an intimidating impression, making her approach difficult for most students. Consequently, she declines gifts from admirers, with the sole exception of Hikari Konohana. To avoid crowds, she trains during early mornings.

Her background involves belonging to the prominent Ootori family, known in the fashion industry and corporate marketing. Family dynamics influenced her enrollment at St. Spica; she transferred to distance herself from her brothers' unspecified "misdeeds" and to integrate into elite social circles associated with families like Hanazono and Konohana. She participated in competitive swordsmanship alongside her brothers prior to her transfer.

Amane's character development centers on her evolving romantic relationship with Hikari Konohana. Their initial encounter occurs at Spica's horseback riding grounds, where Hikari's singing voice deeply moves Amane, reminding her of an angel. Amane gradually recognizes and embraces her romantic feelings, displaying protectiveness and affection. Key moments include covering Hikari with her jacket in cold weather, rescuing her from dangerous situations involving Kaname Kenjō, accepting Hikari's yellow scarf as a treasured gift, and frequently holding her hand. She openly prioritizes Hikari, stating she cannot imagine partnering with anyone else for significant events.

A significant plot point involves Amane suffering partial amnesia after falling from Star Bright during emotional turmoil over her feelings for Hikari. Despite forgetting Hikari's identity, she retains the yellow scarf, sensing its irreplaceable value. She spends days searching for it when lost and wandering near their first meeting spot. Her memory fully recovers one night in a cabin after hearing Hikari sing the same song from their initial encounter, leading to a kiss and implied intimacy.

Following her recovery, Amane reaffirms her commitment to Hikari, declaring her the most precious person in her life and vowing eternal togetherness. She enters the Etoile election with Hikari as her partner. During the campaign, she demonstrates unwavering loyalty, defending Hikari against criticism and comforting her under a tree while promising lifelong protection. She publicly swears to safeguard Hikari "with her life" during the election events. Their partnership culminates in winning the Etoile title jointly.