Minamoto Naomi is a highly talented young racer who competes for the factory-backed kart team Endless Autohouse Racing, where he serves as their top driver. He first appears as the champion of the East Japan Junior Kart category, already accomplished and well-supported compared to the protagonist. Raised from early childhood with the singular goal of becoming a Formula One driver, he received elite-level training and a structured, professional environment that honed his natural gifts. This background shaped a personality marked by strong self-discipline, a fierce competitive drive, and a sharp, observant demeanor that can seem aloof or intense. He is deeply motivated by the pursuit of excellence and the desire to prove himself at the highest levels of motorsport, seeing racing not just as a sport but as a serious profession that demands total commitment. His primary role in the story is that of Capeta Taira's greatest rival, a benchmark of skill and professionalism that Capeta must strive to reach. Their initial encounter, during which Capeta in a makeshift kart briefly challenged him on track, sparks a lasting competitive tension. While Naomi initially dismisses Capeta's lack of proper equipment and funding, he gradually comes to recognize Capeta's raw talent and determination, viewing him as a worthy adversary. Their relationship evolves from simple rivalry into a mutual driver that pushes both to improve, culminating in intense battles in higher formula categories like Formula Stella and Formula Three. Naomi's most significant relationship is with his mother and team manager, Nanako Minamoto, a former professional racer herself who guides his career with a demanding, results-oriented approach. He also develops a subtle, awkward affection for Monami Suzuki, which adds a layer of personal vulnerability to his otherwise focused character. Over the course of the narrative, Naomi undergoes notable development, progressing from karting through the ranks of junior formulae and eventually competing in the F3 Euro Series. His growth is measured not only by his race victories but by his changing attitudes toward Capeta and the nature of competition itself, as he learns to balance his cold professionalism with a grudging respect for a rival who earns his place through sheer talent and will. His notable abilities include exceptional car control, a deep technical understanding of racecraft, and the mental fortitude to perform under pressure. These skills, combined with his unwavering ambition and access to top-tier machinery, make him a formidable opponent and a constant target for Capeta's aspirations.