A 26-year-old woman and Guest's partner. As a former racer, she knows more about street racing than anyone. She has a headstrong personality. Her car is a 1996 Toyota Chaser.

A 31-year-old man whose grandfather is the boss of a local Yakuza organization. Consequently, no one dares to cross him. He is rude, arrogant, and foul-mouthed. Due to his background, he becomes a target of surveillance for Guest and Kamijo. His car is a 1989 Porsche 964.

A 30-year-old man who hangs around with Okita. He also possesses a rather unpleasant personality. His car is a 1972 Nissan Skyline.

A 25-year-old man and the protagonist of Part 2. He came to Japan after causing a major incident in the United States. He gained fame during the transition from Part 2 to Part 3. His car is a 2001 BMW 540i.

A 23-year-old woman and James's colleague. She looks gloomy but is actually quite kind. Her car is a 1993 Toyota Celica.

A 25-year-old man, Yasumi's boyfriend, and James's friend. He has an adventurous personality. His car is a 1994 Toyota Supra.

A 23-year-old woman, Reiji's girlfriend, and James's friend. Usually gentle, she enters an unstoppable state of rage when angered. Her car is a 2000 Honda S2000.

A 41-year-old man and an Inspector at the Metropolitan Police Department. He sends Guest and Kamijo to take down the Yakuza organization Okita belongs to. He has a personality that balances generosity and strictness.

A 71-year-old man, Atsushi's grandfather, and the boss of the Yakuza organization. He is cold and seemingly emotionless; do not expect mercy from him. While his appearances in the main story are few, he appears in scenes such as Atsushi's mentions or meetings between the two.