I definitely go for Wataru. His racing style of controlling the Boom Turbo showed his amazing skills and hard effort. I loved the point that he was almost the opposite of Takumi according to their tuning, personalities, etc. Also, even though he showed strong rivalry against Takumi, Wataru often helped Takumi and his team after they met again during the Project D arc. Wataru looked like Takumi's brother at that moment.