Unlock Final Technique
As the words scroll on the title screen, press L1, L1, L1, L1, L1, R1 to turn the cursor blue. Once that is done, let the words on the title screen scroll again and press R1, R1, R1, R1, R1, L1 on the right controller and the cursor will turn red to confirm the code.

Now press L2, L2, L2, L2, L2, R2 while the words on the title screen scroll again and the cursor will turn green to confirm the code. The Fatal Technique option will be available in the options menu, and you need to assign the function to two buttons. During a match, press those two buttons to do the move.

Battle Arena Toshinden 2 Plus Delete Lifebar Display
Pause a match by pressing START, hold SELECT and press TRIANGLE + SQUARE + CROSS + CIRCLE to toggle the displays on and off.

Camera Control
Set some buttons to "Not Used" then highlight "Camera Type" and press LEFT to give yourself the Control Camera option.

Return to the button configuration and press RIGHT to assign camera control to the button. During a match, you will need to remove the lifebar displays (pause the match, press TRIANGLE + SQUARE + CIRCLE + CROSS) to gain camera control.

Unlock Uranus And The Master
As the words on the title screen are scrolling, press L1, L1, L1, L1, L1, R1. If the cursor turns blue, you entered the code correctly.

Unlock Vermillion And Sho
As the words scroll on the title screen, press L1, L1, L1, L1, L1, R1 to turn the cursor blue. Once that is done, let the words on the title screen scroll again and press R1, R1, R1, R1, R1, L1 on the right controller and the cursor will turn red to confirm the code.