Big Head Mode
Hold Select after choosing a character and keep the button held until the match begins.
Big Body Mode
Hold Down, Select, X until the match starts.
Alternate Costumes
Press L1 at the character selection screen.Level Select:Complete the game as Chewbacca on Jedi level to enable level selection under versus mode.
Fight As A Stormtrooper
Complete the game as Han Solo.
Fight As Darth Vader
Complete the game as Luke Skywalker.Note: The hidden Mara Jane character will appear instead of a mirror match when playing as Darth Vader.
Fight As Jodo Kast
Defeat all ten fighters under survival mode. Fight As Slave Leia:Complete the game as Princess Leia under Jedi difficulty level.
Unlock Slave Leia
Beat Darth Vader as Leia, and you will unlock slave Leia.
Play as Mara Jade
When you are at the main screen, highlight, don't select, the team battle mode, the difficulty has to be on jedi for all of the hidden characters. press L2+L1+R2+Start + it should pick the charactyers for you, just beats the computer and jade is yours.
Vs Mode Kid Mode
On vs. mode to be a little kid, hold Down, Select, X, and R2 at the loading screen until the match starts.
Control Credits
At the loading screen, hold select+R2+L1. During the credits, press Up or Down to change speed or direction of the credits.
Unlock fighting room choice
Just beat the game on hard with Chewbacca - it will tell you the message if done right.