Bunta Fujiwara is the owner of a tofu shop in the town of Akina and the father of Takumi Fujiwara. In the events of Fourth Stage, he is 43 years old. His past is that of a legendary street racer, recognized as the fastest downhill driver on Mount Akina, a title he earned driving a Toyota Sprinter Trueno AE86, which still holds the record for the fastest downhill time on the mountain. Although he no longer participates in public races, he remains deeply involved in the racing world as a mentor and strategist, using his own son as the instrument of a long-term, unorthodox training regimen.

Bunta presents himself as a gruff, often detached figure. His personal likes include the sound of a carburetor and tobacco, while he ironically dislikes tofu, the product he sells for a living. He also reportedly dislikes large cars. His behavior can be interpreted as a calculated form of tough love. Rather than directly instructing Takumi, he creates scenarios designed to force his son to learn and adapt on his own. This is evident from his earliest training method, which involved placing a cup of water in the car’s holder during tofu deliveries and telling Takumi not to spill a drop, ostensibly to protect the tofu but in reality to force perfectly smooth and fluid driving.

Bunta’s primary motivation is the development of his son’s natural talent. He takes a long-term view, having subtly manipulated Takumi’s daily deliveries for five years to build an instinctive driving skill that rivals his own. In Fourth Stage, his role becomes more active and direct. While Takumi has joined the Project D team and is racing across the region with the gifted AE86, Bunta makes a significant personal change. He acquires a new personal vehicle, a powerful Subaru Impreza WRX STI Type R Version V, which represents modern all-wheel-drive technology in contrast to the rear-wheel-drive AE86. He test drives this car on Akina, where he secretly challenges and defeats his son, an act meant to shake Takumi’s confidence and show him the limitations of his current understanding. After revealing he is the new car’s owner, Bunta then imposes a new condition: Takumi must alternate his tofu delivery runs between the AE86 and the Impreza. This is a calculated strategy to broaden his son's driving experience, teaching him about the potential and unique characteristics of different car types and drivetrains.

Key relationships define his role. His relationship with his son, Takumi, is the central axis of the story, one built on unspoken lessons and high expectations. The respect is mutual but rarely verbalized. Bunta also shares a long-standing friendship with Yuichi Tachibana, the owner of the gas station where Takumi works. Yuichi is one of the few people who understands Bunta’s history and his methods, often serving as a confidant or an indirect assistant in his plans. While Bunta’s own wife is not present in the series’ main narrative, his decision to step back from professional racing is often tied to his commitment to family and the tofu business.

Bunta Fujiwara does not undergo a dramatic personal transformation; his development is seen in his shifting strategy as a mentor. He evolves from a passive instructor who set a challenging routine to an active force who directly intervenes to push his son beyond his current plateau. His purchase of the Impreza and his own return to driving, even in a non-competitive capacity, signals a renewed engagement with his own passion for driving as a tool for teaching.

His abilities, even at his age, are presented as nearly supernatural. He is unequivocally the most skilled driver in the series’ world. His talent encompasses not just raw speed but an immense depth of technical knowledge and car control, demonstrated by feats such as lighting a cigarette while maintaining a perfect drift or driving with his eyes closed. He can intuitively adjust a car’s suspension settings to create a specific handling advantage, as he did before one of Takumi’s major races. His victory over Takumi in a more powerful car in Fourth Stage serves as the ultimate proof of his continued mastery, reinforcing that while his son is becoming a great racer, Bunta himself remains the unmatched standard on the mountain roads of Akina.