Naruto: Clash Of Ninja cheats and cheat codes for Gamecube

Unlock Attack Power 4:
Win 1st place in the Time Attack mode. 

Unlock Difficulty 4:
Win 1st palce in the Survival mode. 

Unlock Kyubi Naruto:
You have to of unlocked Rock Lee, Now go to one player, not story mode. Now 
have fun with this part, you have to beat one player mode with everyone, twice! 
Once you do you'll get a message that goes something like this, Press X or Z while 
highlighting Naruto to play as Kyubi Naruto. He's VERY fun to play as.
Note: He doesn't have a Kunai, instead when you use the A button he uses his 
claws to attack. His special does almost as much damage as Kakashi's fully 
charged special. Submitted by: Kyubi Link

Unlock Sharigan Kakashi
Unlock Kyuubi Naruto, then finish Single Player mode with him. 
Then, finish the Single Player mode with Kakashi. Go to the character 
selection screen, highlight Kakashi and press X or Z.

Change clothes:
Highlight a character and hit Y

Unlock Rock Lee
Beat Zaibuzan without using a single continues in story mode.
After, beat Rock Lee when he appears.