Alternate Costumes
Several Characters (mostly Luffy's crew; wich consist of Luffy, Zorro, Sanji, Ussop, Chopper, Nami and Nico Robin) have 3rd and 4th Alternate costumes which are unlocked by doing several tasks.
Luffy's Crew 3rd alternate costume
In training mode, complete the training list with Luffy , Zorro, Sanji, Ussop, Chopper, Nami and Nico Robin.
Luffy's Crew 4th alternate costume
To do this, you must choose the VS option, go against computer in Hard with 3 rounds and try to finish all the rounds with the super level 2 special.
Wiper's 3rd Costume
After getting all the costume, complete Training mode with Wiper again.
Shanks 3rd and 4th Costume
After getting Luffy's pirate 3rd & 4th costume, complete Training mode with Shanks.
Hidden Characters
Unlock the characters in the following order. Certain characters can only be unlocked after reaching a certain requirement. It is recommended that you play with each character on the HARD difficulty setting so you do not need to backplay time after time.
Smoker
Win the game with Roronoa Zoro (Hard mode suggested. Can be unlocked on any difficulty setting).
Wiper
Win the game with Monkey.D.Luffy (Hard mode suggested. Can be unlocked on any difficulty setting).
Omu
Win the game with Tony Tony Chopper (Hard mode suggested. Can be unlocked on any difficulty setting).
Mr Crocodile
Win the game with Nico. Robin (Hard mode suggested. Can be unlock on any difficulty setting).
Enel
After unlocking all the other characters above win the game with Wiper and Monkey.D.Luffy on Hard difficulty setting. (Refer to unlocking Wiper).
Hina
Once you've gained Enel, win the game with Usopp on Hard difficulty setting.
Bon Clay
After gaining Hina, win the game with Sanji on Hard difficulty setting.
Portgas.D.Ace
After unlocking all characters above, beat Training mode with all of Luffy's crew and then win the game with Smoker on Hard difficulty setting.
Red Hair Shanks
Once you've gained every other character, win the game on Hard mode using all of Luffy's crew then win the game once more with Luffy on Hard mode.
Luffy's Crew
Luffy's crew consists of Monkey.D.Luffy, Roronoa Zoro, Nami, Tony Tony Chopper, Usopp, Sanji, Nico and Robin.
Unlock The Windmill Village
You can unlock this stage by collecting all the cards. This stage can only be made available after you unlocked Enel.
Alternate Costumes...