Duel Masters: Cobalt Cheats...
Caitlan
Successfully complete Rusty's story to unlock Caitlan.
Earl
Successfully complete Trey's story to unlock Earl.
Jalen
Successfully complete Rebecca's story to unlock Jalen.
Knight
Successfully complete everyone's story to unlock Knight.
Marcus
Successfully complete Flynn's story to unlock Marcus.
Monks
Defeat the Monks the first time to unlock them.
Sera
Successfully complete Luc's story to unlock Sera.
Widow
Defeat Widow at the end of the tournament to unlock her.
Caitlan...