Remove display

Pause during fight. Hold Circle + Triangle + Square + X and press Select. This will removesthe continue, options and reset selections. While continuing to hold all four buttons, press Select again. This removes the Life and Over Drive bars. To return the display to normal, repeat the code while pressing Select once. 

Random select

Hold L1 + L2 + R1 + R2 at the character select. Press Square, Triangle, X, or Circle while selection box is moving. 

Play as sub-bosses

Beat the game with each basic character at level three or higher to unlock 
his or her sub-boss.

Play as Shou

Unlock all the sub-bosses, then beat the game with Vermilion at level three or higher. 

Play as Abel

Beat the game with Shou at level seven. 
Submitted by Hideyoshi

Play as Veil

Beat the game with Abel at level seven. 
Submitted by Hideyoshi

Play as Naru

Beat the game with Veil at level seven. 
Submitted by Hideyoshi

Alternate costumes

Beat the game with Naru at level seven. Use Square or X to select a character. 
Submitted by Hideyoshi

Instant secret moves

Beat the game with Naru, then set two or more of the L and R buttons to special moves. Press all special move buttons at once to perform a secret move. Note: that this does not work for all characters. 
Submitted by Hideyoshi

Unlimited Soul Bombs

Press Start to pause a match. Use the controller configuration option to map the L1, L2, R1, and R2 keys to Soul Bombs. Resume game play and press one of the those buttons and X simultaneously to release a Soul Bomb. That button combination may be pressed an unlimited amount of times during the match. 
Submitted by Hideyoshi

Manual camera control

Enter the button configuration menu, highlight any shoulder button, and press L1 + L2 + R1 + R2. The controls for the shoulder buttons will change to camera view controls. The view may now be rotated manually.