Fuji Kiseki is a prominent character in Uma Musume Pretty Derby: Beginning of a New Era, where she serves as a senior student and a significant influence on the main protagonist, Jungle Pocket. She is a tall and striking figure with an elegant and charismatic presence, noted for her short, dark blue-black hair with a distinctive bleached forelock. Her bearing is often described as dashing, and she carries herself with the confidence of a natural performer, a quality derived from her family background.

Her personality is a blend of warm-heartedness, playfulness, and a profound sense of responsibility. Fuji Kiseki takes on the role of leader of the Ritto Dormitory at Tracen Academy, a position she handles with care and diligence. Despite her cool, leading-role aura, she is deeply altruistic, never hesitating to help any student in trouble and always willing to lend an ear to those struggling with the pressures of competition. She is known for her theatrical mannerisms, often using gentle gestures, magic tricks, or small surprises to cheer up those around her, though this charm is genuine and not flirtatious in nature. Her word is seen as reliable, and she is adored by younger students, who often affectionately call her Fuji.

Fuji Kiseki's motivation to race is deeply intertwined with her love for the stage. Her mother was a top-class stage actress, and before coming to Tracen Academy, Fuji Kiseki herself dreamed of a career in theatre. She ultimately found that the racetrack was her stage, and her goal is to captivate audiences with her running in the same way her mother captivated theatergoers. Above her theatrical aspirations, her ultimate ambition is to claim the Triple Crown, viewing it as the grandest performance of all.

In the story of Beginning of a New Era, Fuji Kiseki exists as an idol and mentor figure to the next generation. Her performance in the Twinkle Series is the catalyst that inspires Jungle Pocket to enroll at the academy and pursue the Classic Triple Crown. Though she is no longer an active runner by the time of this film, she has transitioned into a supportive role, acting as a big sister and guide for Pocket. She is deeply trusted by her former trainer, Tanabe, and this trust extends to her support of Pocket's training. Her key relationships include her close friendship with Hishi Amazon, the leader of the Miho Dormitory, and she is admired by Jungle Pocket, who looks up to her as a senior.

Fuji Kiseki's character development touches upon the challenges of defining one's own running style while supporting others. Even while she herself struggled with this, she never abandoned those who came to her for help. Her narrative also carries a subtle acknowledgment of unrealized potential, reflecting the history of the real-world racehorse she is based on, which was forced into early retirement due to injury while still undefeated. This adds a layer of poignancy to her role as a mentor, guiding younger students toward a crown she herself could not claim.

As a competitor, Fuji Kiseki possesses notable abilities that make her a formidable runner. She specializes in turf tracks and is most proficient at mile distances, though she can also effectively handle medium distances. Her preferred racing style is that of a Pace Chaser, meaning she excels at following close behind the leader and then using her impressive speed and power to pull ahead for victory on the final homestretch. Her unique skill is often a dazzling display of speed that activates on the final straight when she is near the front of the pack, which she calls Lights of Vaudeville, further cementing her identity as an entertainer on the track. Beyond racing, her talents include absolute pitch, mechanical repair skills, and a talent for stage magic and voice imitation, all of which she uses to entertain and support her fellow students.