Alternate costumes:
Complete the following goals to unlock the corresponding costume for the indicated character.

Unlock Bon Clay:
Unlock Hina, then successfully complete Event Battle as Sanji under the hard difficulty setting.

Unlock Ace:
Unlock Bon Clay and the third costumes for Luffy, Zorro, Nami, Usopp, Sanji, Chopper and Robin (by completing training mode with them), then successfully complete Event Battle as Smoker under the hard difficulty setting.

Unlock Shanks:
Unlock Ace, complete Event Battle under the hard difficulty setting as Luffy, Zorro, Nami, Usopp, Sanji, Chopper and Robin, and unlock the Windmill Village and Marine HQ stages. Then, successfully complete Event Battle as Luffy under the hard difficulty setting.

Super Hard difficulty:
Successfully clear all moves for all sixteen characters in training mode.

Windmill Village stage:
Unlock Enel, then collect all 48 cards in Event Battle.

Play as Crocodile:
Successfully complete Event Battle as Robin.

Play as Orm:
Successfully complete Event Battle as Chopper.

Play as Smoker:
Successfully complete Event Battle as Zoro.

Play as Wiper:
Successfully complete Event Battle as Luffy.

Play as Enel:
Unlock Smoker, Crocodile, Wiper, and Orm, then successfully complete Event Battle as Luffy or Wiper.

Play as Hina:
Unlock Enel, then successfully complete Event Battle as Usopp under the hard difficulty setting.