You can purchase the racers below with the following number of SEGA Bucks. You can earn SEGA money by racing and racking up mileage.

Ulala (Space Channel 5) - $12500
Jacky Bryant and Akira Yuki (Virtua Fighter) - $18500
Chuchu Pilots (Chuchu Rocket) - $25500
Opa-Opa (Fantasy Zone) - $32500