If you do not want to grind manually, you can use pre-made save files or cheats:
_C0 Max Level All Characters _L 0x81234567 0x01230001 _L 0x00000063 0x00000000 naruto ultimate ninja impact save data level 99
Every character is immediately available for selection in both Tag Climax and Extra Missions. If you do not want to grind manually,
