Successfully complete the game.

Successfully complete the game.

Defeat the following characters in arena mode to unlock them as playable characters:

Aburame Shino
Akimichi Chouji
Dosu Kinuta, Gaara
Haku, Hatake Kakashi
Hyuuga Hinata
Hyuuga Neji
Inuzuka Kiba
Kankurou
Kin Tsuchi
Momochi Zabuza
Nara Shikamaru
Rock Lee
Temari
TenTen
Yamanaka Ino
Zaku Abumi

Unlock arena mode, then press Start, Down, Up, Down, Up, Right, Right, Left, Left, Right, Down, Select at the map screen.