Itsuki Takeuchi (武内 樹 Takeuchi Itsuki, known as Iggy in the Tokyopop version) is Takumi's best friend; he provides the comic relief in the series, and is generally quite loud and obnoxious. Itsuki works part-time at a gas station with Takumi and Iketani; Itsuki plans to use the money he earns to buy an AE86 Corolla Levin (to complement Takumi's AE86 Trueno) but mistakenly buys an inferior (less power, poor brakes, less chassis bracing, and looser suspension) AE85. This upsets him until Takumi takes him for a drive (ultimately racing it downhill), demonstrating that the driver's skill can make a difference. With a car, he is a self-proclaimed member of the Akina SpeedStars. He eventually purchases a turbocharger for his Eight-Five. Self-proclaimed "Lonely Driver".
Likes: Taiwanese bananas, cheesecake, all cars popular among street racers and horsepower, cute girls in miniskirts, his AE85, AE86 (both Trueno and Levin).
Dislikes: FF, his scooter, trash talkers, and Automatic diesel cars.
Itsuki returns to chapter 96 of MF Ghost where he still lives in Shibukawa and still works at the gas station (although it is an ENEOS EV station). He is married and has children. It is revealed that his body weight increased 20 pounds.