Eiji Kubo (久保 英次 Kubo Eiji) 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.
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- He owns a car shop.