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Gamecube - Naruto: Gekitou Ninja Taisen! 3 cheats

Go to the character slection screen and press the indicated buttons:

Sakura with long hair: Hit X to select Sakura
New Sakura costume: Hit Z to select Sakura 
Ino with long hair: Hit X to select Ino
New Ino costume: Hit Z to select Ino
Haku without mask: Hit X to select Haku
New Haku costume: Hit Z to select Haku
Original Sasuke: Hit X to select Sasuke
New Sasuke costume: Hit Z to select Sasuke

Unlockable Characters:
Go to Anko's shop to purchase the following characters:
Akamaru - 2500
Anko - 15000
Gaara - 4500
Gai - 6000
Haku - 4000
Hinata - 4000
Ino - 6000
Itachi - 100000
Kankuro - 2500
Karasu - 2500
Kiba - 2500
Mizuki - 15000
Orochimaru - 50000
Sandaime - 75000
Shino - 7500
Temari - 6000
Ten-Ten - 4500
Tsunade - 50000
Zabuza - 4000

Begin with bonus money:
Have a saved game from Naruto Gekito Ninja Taisen! 2 on your memory card

Shadow Mode:
Unlock Mizuki as well as all previous Game Modes