Unlocking Characters in Naruto USA
All in Heroes mode:

Gaara                         Leaf Destruction!! (Normal)
Itachi & Kisame               Atatsuki Returns (Insane)
Kakashi & Guy                 Survival Exercise (Easy)
Tsunade, Orichmaru & Jiraiya  The Legendary Sannin (Hard)

Hidden Team Skills
     Use  the  following custom made team characters in Heroes Mode to
unlock a new skill. The characters can be selected in any order.

Akatsuki                      Itachi and Kisame
Association of Ninja Thugs    Itachi, Kisame, Orochimaru
Aurora of Legends             Orochimaru, Tsunade, Jiraiya
Author & Fan                  Jiraya and Kakashi
Eternal Rivals                Kakashi and Guy
Hard Work United              Lee, Naruto, Hinata
Hidden Spikes                 Any Team combo
Hot Blood Master & Student    Guy and Lee
Indonmitable Guts Points x 2  Naruto and Jiraiya
Maidens In love               Ino, Sakura, Hinata
Proof of The Existence        Sasuke, Naruto, Gaara
Sharingan to the Max          Sasuke, Itachi, Kakashi
Team Byakugan                 Neji and Hinata
Team Genius                   Neji, Sasuke, Shikamaru
The Cursed                    Orochimaru and Sasuke
Triple Trouble                Naruto, Kiba, Chouji
Uchiha Clan                   Sasuke and Itachi