dude, i will give you the cheats, but i would like to say that this site is called super CHEATS! you can get these cheats in the PSP section....jeez..
Unlock Art Gallery:
Successfully complete the game 100%.
Unlock Arcade Intro Videos:
Successfully complete the game 100%.
EX Option List:
When you select 'Options' from the Main menu hold down the L button.
Unlock Shadow:
Highlight the '?' and press 'START' five times when selecting your character then press any punch or kick.
Unlock Marionette:
Highlight the '?' and press 'START' seven times when selecting your character then press any punch or kick.
Unlock Oboro Bishamon:
Hold down 'START' and press any punch or kick when selecting your character.
go here for a good time!!!!
http://s15.invisionfree.com/Funforums/index.php