Each time you complete the game a different character is unlocked.
Each character has a total of four difference costumes that can be used all modes except for Story mode. In order to use one of these costumes, simply hold R1, R2, L1, or L2 while selecting the character of your choice. (R1 will select the default costume color)
To unlock Sion's sensei, Wong you must play through the game as any character. When you come up to the battle against Kaldea (the battle right before the final fight), have any character other than Sion fight her. Then, use Sion to complete the game.
During the end sequence, right before Dominique comes to visit Sion while he is working the door of the bar, you will view a flashback sequence where Sion will do battle with his master, Wong.
Wong fights similar to both Sion and Dauragon. He uses the same two-fisted attack as Dauragon (where he can hit an opponent both in front of him, and behind him), as well as leg sweeps similar to Sion. You can use normal attacks against him, but one special move in particular works very well.
Block attacks from Wong, and while he is recovering from one press the ES+MEDUIM buttons (whatever you have them assigned to) to perform the Torpedo Kick move, which will take off a bit of damage and knock Wong off his feet. Turn that into a pattern: Block, Torpedo Kick, Block, Torpedo Kick, etc. to defeat Wong, who you can then use in the Versus mode.
submitted by Rapid_Torpidity(rtorpid@mail.com
When you play through the game you will notice Kou talking on the phone to someone. If you play through as Kou, you will hear this person talking and learn that she is actually someone else, who just looks like Kou. Her name is actually Leann. You can play as Leann by playing through the entire game as Kou (which means, you cannot switch to any other character at any time during the game).
During the end sequence, Kou will encounter Leann in the Central Square area and do battle with her. The best way to defeat her is to block her attacks and use the Circular Uppercut (ES+MEDIUM buttons) move to juggle her into the air.
submitted by Rapid_Torpidity(rtorpid@mail.com
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.
Complete survival mode by defeating the black-hooded version of Sion to unlock that costume in survival and versus modes.
You can increase the rank of extra characters in survival and versus modes every time story mode is completed (all except Volt, Sion, and Kou)
Complete story mode with Sion.