Enter these passwords in the Password section to unlock the following characters:
Passwords can be entered with all 4 directions and the A, X, Y, L, and R buttons. Press Start after entering the complete password to unlock.
Beat single player in any difficulty to unlock the following characters:
Once you enter these passwords, the characters will have a shining star next to their voice part in their extra profile. Keep in mind to complete the single play mode for all characters in order to get all the comical voice clips.