Naruto: Gekitou Ninja Taisen! 2 Cheats for Game Cube

Alternate Mizuki:

Highlight Iruka and press X at the character selection screen for his original costume. Highlight Iruka and press Z at the character selection screen to have Mizuki in an alternate costume.
Unmasked Haku:

Highlight Haku and press X at the character selection screen for unmasked Haku. Highlight Haku and press Z at the character selection screen to have unmasked Haku in an alternate costume.
CPU battle mode:

Successfully complete story mode to make this available for purchase at Ankos shop.
Select costumes:

Highlight a character and press Y at the selection screen.
Long-haired Sakura:

Highlight Sakura and press X at the character selection screen. Highlight Sakura and press Z at the character selection screen to have long-haired Sakura in an alternate costume.
Team battle mode:

Get the best score in time attack mode to make this available for purchase at Ankos shop.
Shadow fighting mode:

Get the best score in time attack mode to make this available for purchase at Ankos shop.
Bonus story mode battles:

Successfully complete the first twenty episodes of story mode to unlock a new episode that is available for purchase at Ankos shop.. Complete that episode to unlock the next bonus episode. There are a total of ten bonus story mode episodes that can be purchased.
Background music option:

Buy all of the bonus story mode battles to make this available for purchase at Ankos shop.
Additional difficulty option:

Finish in first place in survival mode to make this available for purchase at Ankos shop.
Additional damage option:

Finish in first place in time attack mode to make this available for purchase at Ankos shop.
Stats option in Omake menu:

Successfully complete the first twenty episodes of story mode to make this available for purchase at Ankos shop.
Character profile option:

Successfully complete the game to unlock the corresponding character profile for that person available for purchase at Ankos shop.
Character sound effects:

Successfully complete the game to unlock the corresponding sounds for that person available for purchase at Ankos shop.