Successfully complete Rusty's story to unlock Caitlan.
Successfully complete Trey's story to unlock Earl.
Successfully complete Rebecca's story to unlock Jalen.
Successfully complete everyone's story to unlock Knight.
Successfully complete Flynn's story to unlock Marcus.
Defeat the Monks the first time to unlock them.
Successfully complete Luc's story to unlock Sera.
Defeat Widow at the end of the tournament to unlock her.
Go into the card shop or the nature preserve.If you look closely,you can see pictures of Shobu and also some products with "Duel Masters" written on it.
Hold R3 and press X, Square, Triangle to add one shield for player one. Hold R3 and press X, Circle, Triangle to add one shield for player two.
At the deck building screen, hold R3 and press L1(3). You will get four of each card
At the map screen, hold R3 and press Circle(3).
At the deck building screen, hold R3 and press L1(3) to unlock Chuck in arcade mode.
Hold R3 and press Triangle, Square, X to remove one of player one's shields. Hold R3 and press Triangle, Circle, X to remove one of player two's shields.
Win 100 duels in arcade mode and unlock Shobu
Hold R3 and press L1, R1, L1 to give player one the win. Hold R3 and press R1, L1, R1 to give player two the win.