Naruto: Gekitou Ninja Taisen Unlock Extra Characters
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.
Naruto: Gekitou Ninja Taisen Alternate Costumes
On the character select screen, highlight a character and press Y.
Naruto: Gekitou Ninja Taisen Unlock Sound Test
Beat the game with every default character.