Game Platforms

One Piece : Grand Adventure

GameCube

Secret Character Shanks

In Buggy's adventure mode, recruit Shanks and then win a battle using him

Crocodile

To unlock Crocodile as a playable captain in Adventure Mode, in Luffy's Adventure Mode, defeat Crocodile in Alubarna on the Alabasta Kingdom Sea Area Map, and after you defeat him, get the rank "Top Pirate on the Island". Before or after the credits, you will recieve Crocodile as a Playable Captain in Adventure Mode.

Secret Character Eneru

In Crocodile's adventure mode, get Eneru as your ally in the Jaya area, and win a battle using him

Buggy

To unlock Buggy as a Captain in Adventure Mode, in Luffy's Adventure Mode, defeat Crocodile in Alubarna on the Alabasta Kingdom Sea Area, and recieve the rank "Top Pirate in Town", and before or after the credits, you will recieve Buggy as a Playable Captain in Adventure Mode.

Secret Character Ohm

In Crocodile's adventure mode, get Ohm as your ally in the Jaya area, and win a battle using him

Secret Character Trace (Ace)

In Buggy's adventure mode, recruit him in Drum Island, then win a battle using him

Secret Character Nico Robin

In Luffy's adventure mode, get her as your ally at the end, and win a battle using her

Secret Character Mr. 2 Bon Clay

In Crocodile's adventure mode, get Mr. 2 as your ally, and win a battle using him

Secret Character Mihawk

In Chaser's (Smoker) adventure mode, after recruiting Mihawk, win a battle using him.