Unlock Akuma: First, unlock Sakura, Dan, Cammy, Fei Long, Gen and Rose then fight Akuma on arcade mode. Get at least 2 perfects and 2 Ultra Finishes to unlock him. Unlock Gouken: First, unlock Akuma, Sakura, Dan, Cammy, Fei Long, Gen and Rose then Fight him on arcade mode. Get at least 2 perfects and 2 Ultra Finishes 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