Kouji

The Earth Team's co-mechanic and electronics specialist. Originally working at Miguel's Garage, he is hired by Don Wei as part of the Earth Team. Shy and non-combative by nature, he prefers to avoid conflicts but his quick thinking has saved the Earth Team on many occasions. It was his idea for the 'clustered turbine' hyperdrive that allows the team's new racer, the Whizzing Arrow III, to be much faster than their previous racers. (from Wikipedia)