i played the game and its so awesome and i got all characters!!! anyway i got a cheat code here to unlock all characters:
Unlock Characters: Go to the main menu hold R1 + R2 then press Square Triangle Square Triangle Release R1 + R2, the hold L1 + L2, and press Right Up Right Up release L1 + L2 then press L3 + R3 (analog Sticks pushed down), a sound will confirm correct code entry, All characters except Hanabi Hyuuga and Yondaime (Hokage 4) will be unlocked
to make the character go to its 2nd stage like naruto, sasuke, sound 5, etc.: first you have to beat the game after that highlight the character of your choice and hold select and there you have it.