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Street Fighter IV

Unlockable Characters

Akuma - After unlocking Sakura, Dan, Cammy, Fei Long, Gen and Rose, Fight him on arcade mode, to do that, Get at least 2 perfects and 2 Ultra Finishes. 
Cammy - End the arcade mode with Crimson Viper 
Dan - End the arcade mode with Sakura 
Fei Long - End the arcade mode with Abel 
Gen - End the arcade mode with Chun-Li 
Gouken - After unlocking Akuma, Sakura, Dan, Cammy, Fei Long, Gen and Rose, Fight him on arcade mode, to do that, Get at least 2 perfects and 3 Ultra Finishes. 
Rose - End the arcade mode with M.Bison 
Sakura - End the arcade mode with Ryu 
Seth - End the game with all the other characters