Naruto - Clash of Ninja - Platform: Gamecube

Alternate Costumes:
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On the character select screen, highlight a character and press Y.

Unlock Extra Characters:
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Rock Lee - Beat Zaibuzan in story mode without using continues, and 
then beat Rock Lee when he appears.

Kyuubi Naruto - Unlock Rock Lee, and then beat the game with all 
characters. Now highlight Nartuto on the character select screen 
and press X or Z.

Sharingen Kakashi - Beat the game with Kyuubi Naruto, and then beat 
the game with Kakashi. Now highlight Kakashi on the character select 
screen and press X or Z.

Unlock Hinata:
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Clear story mode using Sakura. Find this fighter by highlighting 
Rock Lee and pressing X.

Unlock Sound Test:
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Beat the game with every default character.