One Piece: Grand Adventure GameCube Cheats

 Buggy:


Reach the "Top Pirate of the Island" rank to  unlock Buggy as a captain in Grand Adventure mode. 
 Chaser:


  Reach level 15 with him in Chaser's adventure, then  win a battle using him. 
 Chaser (Smoker):


Get the "Top Pirate of the Grand Line" rank  to unlock Chaser (Smoker) as a captain in Grand Adventure mode. 
 Crocodile:


Get the "Top Pirate of the Continent" rank  to unlock Crocodile as a captain in Grand Adventure mode. 
 Eneru:


In Adventure mode as Crocodile, get Eneru as an ally  in the Jaya area. Then, win a battle using him. 
 Kuina:


  In Adventure mode as Chaser, recruit Kuina in the ship  graveyard. Then, defeat Zolo using her in Alabasta. 
 Mihawk:


  In Adventure mode as Chaser (Smoker), get Mihawk as  an ally. Then, win a battle using him. 
 Mr. 2 Bon Clay:


In Adventure mode as Crocodile, get Mr. 2 Bon Clay  as an ally. Then, win a battle using him 
 Nico Robin:


  In Adventure mode as Luffy, get Nico Robin an ally.  Then, win a battle using her. 
 Ohm:


  In Adventure mode as Crocodile, get Ohm as an ally  in the Jaya area. Then, win a battle using him  
 Shanks:


  In Adventure mode as Buggy, get Shanks as an ally.  Then, win a battle using him. 
 Trace (Ace):


  In Adventure mode as Buggy, recruit Trace in Drum Island.  Then, win a battle using him. 
 Ussop:


Defeat the final boss in Adventure mode as Luffy, Buggy,  Crocodile, and Chaser in any order. 
 Zeff:


  In Adventure mode as Chaser, get Zeff to level 15 and  use him once in battle.
 Support characters in Grand Battle mode: 


Use a support character for three battles in Adventure  mode, and they can be used by any character in Grand Battle mode. 
 Versus mode passwords:


Enter the following case-sensitive passwords to unlock  the corresponding level 100 character in Versus mode.