STREET FIGHTER IV [cheats]

Unlock Akuma:
First, unlock Sakura, Dan, Cammy, Fei Long, Gen and Rose then fight Akuma on arcade mode. Get at least 2 perfect (in single round matches) and use no continues to unlock him.

Unlock Gouken:
Complete the game with Akuma. Then (in single round matches) get at least 1 perfect, 3 Ultra Finishes, 5 first attacks and don't use any continues to unlock him.

Unlock Cammy:
End the arcade mode with Crimson Viper

Unlock Dan:
End the arcade mode with Sakura

Unlock Fei Long:
End the arcade mode with Abel

Unlock Gen:
End the arcade mode with Chun-Li

Unlock Rose:
End the arcade mode with M.Bison

Unlock Sakura:
End the arcade mode with Ryu

Unlock Seth:
End the game with all the other characters