You unlock them by doing missions, you can find them in the homepage, if you are a genin you can only do D and C rank missions... Also you can do 1 on Shippuuden.
The key is to get your rank up and do all the missions.
No. But you have to do missions to unlock characters.
You have to do the missions.
there are no cheats on naruto arena to unlock all characters figer this out
You can't; he isn't an available character for unlocking.
you must first finish all missions and then you can unlock them!
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sakura is already unlocked...
Ino and choji and shikamuru
Four wins in a row with Hyuga Neji
Try Sasuke Tayuya and Naruto(S)
depends on who u r gud at