Shuichi Matsumoto

The personal mechanic for Takumi Fujiwara's AE86 and possibly Chief Mechanic for Project D. He is the driver for Project D's support van #3 during their expeditions.

Tomiguchi

Keisuke's assigned mechanic in Project D. He is likely the driver of van #4 during the latter part of Project D's expeditions where they go to farther prefectures.