To unlock every character in the game automatically, do the following:
At the game's main menu, hold down R1 and R2 together, and press Square, Triangle, Square, Triangle.
Then, press and hold down together L1 and L2, pressing Right, Up, Right, Up.
Finally, press L3 and R3 (analog sticks) together.
If done correctly, a sound will chime, and the characters will be unlocked for use.
Unlockable: Characters (More)
Here are more characters you can unlock in the game, along with the method each character can be unlocked.
* Anbu Kakashi - Finish Ultimate Road
* Anko Mitarashi - Beat her in Ultimate Road
* Asuma Sarutobi - Beat him in Ultimate Road
* Hanabi Hyuuga - Date her in Ultimate Road
* Kurenai Yuhi - Beat her in Ultimate Road
* Taijutsu Naruto - Finish Ultimate Road
The characters listed below can be unlocked by completing the missions listed in Story Mode.
The following characters can be unlocked rather easily in VS. mode. To select the special character on the left, hold down the Select button while you select the normal character listed on the right.