Naruto: Uzumaki Chronicles 2 Cheats

Charater unlockable guide
Choji: Complete chapter 6
Gaara: Finish chapter 9
Itachi: Beat kakashi gaiden
Kakashi: Beat chapter 1
Kakashi Gaiden: Beat all missions(including S-rank)
Kankoro: Unlocked from the start
Kisame: Beat kakashi gaiden
Might Guy: Beat chapter 8
Neji: Beat chapter 3
Rock Lee: Beat chapter 5
S-rank missions: Beat Story once
Sakura: Beat chapter 1
Sasuke: Beat story mode twice
Shikamaru: Beat chapter 4

Unlockble missions,story and characters
Hoshigake Kisame(In 2 Player vs. mode): Finish Kakashi Gaiden
Kakashi Gaiden(Story): Complete all missions(Including S Ranks)
Sasuke: Pass story mode twice
Uchiha Itachi(In 2 Player vs. mode): Finish Kakashi Gaiden
Unlock S Rank Missions: Complete the game once

Restore Chakra
During the Loading screen if allocated enough time to move the right thumbstick enough in a circle. A Blue Chakara Ball will pop-out and if you notice your unfilled Stamina / Chakara Bar. It will refill a little about 25% worth everytime you do this. Between Loading screens with the Konoha Symbol in the lower right corner.