Eiji Kubo
Eiji Kubo is the Chief Mechanic of Sidewinder. Kubo appears to have a high amount of knowledge about a car's performance and capabilities as well as race theories. He can make very precise anticipations as he did during Project D races against Team 246. As seen in the manga, Kubo has been entrusted to analyze and evaluate Project D's weaknesses. (Source: Wikipedia)
Mangaography