One Piece Grand Battle! 3

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 Finish Event Battle as Smoker under the hard difficulty setting.
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Unlock Bon Clay
Unlock Hina, then Finish Event Battle as Sanji under the hard difficulty setting.
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Unlock Crocodile
Finish Event Battle as Robin.
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Unlock Enel
Unlock Smoker, Crocodile, Wiper, and Orm, then Finish Event Battle as Luffy or Wiper.
(Thanks to UIC_Foz12@aol.com)

Unlock Hina
Unlock Enel, then Finish Event Battle as Usopp under the hard difficulty setting.
(Thanks to UIC_Foz12@aol.com)

Unlock Marine HQ stage
Enter training mode and get your bomb catching over 51.
(Thanks to UIC_Foz12@aol.com)

Unlock Orm
Finish Event Battle as Chopper.
(Thanks to UIC_Foz12@aol.com)

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, Finish Event Battle as Luffy under the hard difficulty setting.
(Thanks to UIC_Foz12@aol.com)

Unlock Smoker
Finish Event Battle as Zoro.
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Unlock Windmill Village stage
Unlock Enel, then collect all 48 cards in Event Battle.
(Thanks to UIC_Foz12@aol.com)

Unlock Wiper
Finish Event Battle as Luffy.
(Thanks to UIC_Foz12@aol.com)