Speed Racer: The Videogame Codes -

Bonus characters:
Reach the indicated number of fans to unlock the corresponding character.

Booster Mbube (Surge Box): 200,000 fans 
Cannonball Taylor (GRX): 140,000 fans 
Delia (Chichi): 350,000 fans 
G. Danneskjold (Taangrisnir): 275,000 fans 
Gray Ghost (Fumee): 60,000 fans 
Kellie Kalnikov (Matryoshka): 100,000 fans 
Mariana Zanja (Petrobras-1): 500,000 fans 
S. Storm (Nukeshot): 425,000 fans 
Sonic Renaldi (Chalk-head): 30,000 fans 
Taejo Togokahn (Hangul): 600,000 fans 

Quick Stunts mode:
Win the World Racing League under the Easy difficulty setting.

Quick Battle mode:
Win the Pro AM Class in the World Racing League.

Time Attack mode:
Win the Pro Class in the World Racing League.

Mach 5:
Win the World Racing League under the Easy difficulty setting.

Pro Class:
Win the World Racing League under the Easy difficulty setting.