Complete the game three times using any character. After defeating Duragon for the second time, he will get up again and fight topless. Defeat him to unlock Topless Duragon in versus mode. Unlock Kou with MSF costume Play through story mode with any character. When you come to it, use Kou to infiltrate the Mikado Building. The MSF costume for Kou will now be unlocked in survival and versus modes.