Hold the Select button while the world map is on the screen before a match begins. You will be able to change your controller configuration.
Extra endings
To get better endings, beat the game at the highest difficulty. Each character has a different ending, so you can have 8 different endings!
Extra Sounds
To listen to extra sounds on 1f to 23 on the Option Screen, go to sound 25, 26, or 27. Then rapidly press the R button. The new sounds should be there.
Get Full Character Profiles
Press and hold L and R on the second controller to see their profiles.
Remove Energy Bars, Timers, and Sound
Go into the Options menu and press Start to return to the main menu. Repeat this process 27 times.
Configuration Screen...