Retro Game Cheats for One Piece: Grand Adventure (Gamecube)
Effect: Secret Character Trace (Ace)
When:
During the game
How:
In Buggy's adventure mode, recruit him in Drum Island, then win a battle using him
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Effect: Secret Character Mihawk
When:
During the game
How:
In Chaser's (Smoker) adventure mode, after recruiting Mihawk, win a battle using him.
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Effect: Secret Character Ohm
When:
During the game
How:
In Crocodile's adventure mode, get Ohm as your ally in the Jaya area, and win a battle using him
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Effect: Secret Character Mr. 2 Bon Clay
When:
During the game
How:
In Crocodile's adventure mode, get Mr. 2 as your ally, and win a battle using him
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Effect: Secret Character Eneru
When:
During the game
How:
In Crocodile's adventure mode, get Eneru as your ally in the Jaya area, and win a battle using him
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Effect: Secret Character Nico Robin
When:
During the game
How:
In Luffy's adventure mode, get her as your ally at the end, and win a battle using her
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Effect: Secret Character Shanks
When:
During the game
How:
In Buggy's adventure mode, recruit Shanks and then win a battle using him
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