Bunus Characters and Saskue missions
Ok. The bonus characters are Kyuubi Naruto(or demon fox), and cursed seal lv1 saskue. To unlock the saskue, you have to beat all practice, d-rank missions, and I think half of the c-rank misions. To unlock Naruto(Kyuubi), you must complete all b-rank missions!
Now, for the saskue missions, to get all of his chakra down is a NO BRAINER. Just use Neji or Hinata, and use their Level 2 special jutsu, which grants Byhugan, and everytime you hit the opponent, they lose chakra(even when their gaurding!)
If you need more help, we've got more Naruto: Ultimate Ninja cheats and also check out all of the answers for this game
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