Naruto: Gekitou Ninja Taisen! 3 Cheat Codes for Gamecube

Unlockable Characters
Go to Anko's shop to purchase these fighters! They will have a Blue Icon with the Konoha (Swirl-looking) symbol

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

Submitted by john

Additional money
If you have a save file of 'Naruto - Gekitou Ninja Taisen! 2' present on your memory card you will start with an additional 20,000.
Also, if you have a save file of the original 'Naruto' game you will start with an additional 10,000.