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Playstation 2 - The Bouncer cheats

Unlock Topless Duragon
Finish story mode 3 times with any character. 
Beat Duragon for the 2nd time, next time he will fight in topless. 

Unlock Kou with MSF outfit in survival and versus modes
Finish story mode with any character. 
Infiltrate with Kou in the Mikado Building. 

Unlock Sion with black hood outfit in survival and versus modes:
Finish survival mode by beating the black-hooded version of Sion

Unlock extra characters in survival and versus mode:
Finish story mode

Different outfits in survival and versus modes
Hold L1, L2, or R2 and select a fighter, while you are at the character 
selection screen.