Hiroshi Kamikaze serves as a supporting character in the Saionji Racing Team, taking on the role of a young and spirited racing driver. At seventeen years old, he is the youngest member of the team, a fact that shapes much of his experience and how he relates to his fellow competitors. His youthful appearance is distinctly marked by a childish tooth gap, and his most recognizable feature is the long fringe of hair that habitually covers his eyes. This is a deliberate, almost shy, concealment; he only reveals his eyes when he is truly excited or emotionally stirred by the heat of competition. His social and professional circle is primarily defined by his relationships with his teammates. He shares the garage with Ken Hayabusa, the main driver and clear protagonist of the team, and Tetsuo Iwata, forming the core trio of racers who represent Saionji in nearly every major event. While his friendships with both are implied, the bond with Ken appears particularly significant, as Hiroshi looks up to him as a close friend and a benchmark for skill and composure.

Hiroshi's personality is a blend of earnest determination and fragile vulnerability, a direct result of his youth and the high-pressure world of competitive racing. He is not as hardened as some of his older rivals or teammates, making him prone to emotional highs and lows. This is most dramatically illustrated during the African course, a pivotal episode that provides the deepest insight into his character. When his racing car is destroyed during a particularly grueling leg of the race, the emotional toll is so severe that he is driven to tears and declares his intention to quit the team. This moment of desolation showcases the "Break the Cutie" aspect of his arc, demonstrating how the brutal reality of motorsport can deeply wound an innocent and passionate young man. His motivations are deeply personal and rooted in his background. Unlike the revenge-driven motives of Ken, whose brother was killed by the villainous Black Shadow organization, Hiroshi is primarily driven by a desire for approval and connection. The episode set in Africa also reveals his humble origins; he comes from a very rural part of Japan, and his mother still lives there. His efforts on the track are often intertwined with a wish to prove his worth to her, as seen in a later All-Japan race where he pushes himself to perform well specifically to show her his growth and ability. The absence of any mention of his father suggests he comes from a single-parent family, further reinforcing the strength and importance of the bond with his mother.

As a member of the Saionji Racing Team, which was founded specifically to counter the criminal activities of the Black Shadow organization that had corrupted international racing, Hiroshi's role is to be a reliable supporting driver for the team's primary champion, Ken Hayabusa. He participates in almost every race, often running interference or acting as a secondary contender. However, his narrative function goes beyond mere support; his struggles serve to humanize the high-octane world of the series. While his teammate Ken represents the stoic, vengeance-fueled ace, Hiroshi provides an emotional counterbalance. His journey is not about defeating the main villain, Baron, but about overcoming his own self-doubt and fear. This development is most evident in his response to crisis. The destruction of his car in Africa represents a critical low point, a test of his will. While his first instinct is to flee, he ultimately finds the resolve to continue, demonstrating that his kindness and sensitivity are not weaknesses but sources of a different kind of strength. This emotional arc culminates in the later All-Japan race, where he must confront the psychological shock of being involved in an accident that injures another driver. This incident shakes his confidence, and team orders require him to race again despite the trauma, forcing him to confront the harsh realities of professional racing and push past his mental barriers.

Regarding his abilities as a driver, Hiroshi is no match for the raw talent of Ken Hayabusa, but he is a competent and passionate racer in his own right. He is skilled enough to be selected as a core member of an elite, internationally focused racing team. However, his technical skills are often overshadowed by his emotional state; his performance is directly linked to his confidence and mental well-being. He does not possess any special gimmicks or unique driving techniques not shared by his peers. Instead, his growth as a racer is a direct reflection of his emotional and personal development. His journey is about learning to channel his love for racing and his desire to make his mother proud into a resilient form of courage, allowing him to keep his eyes open and on the road ahead, both literally and metaphorically.