To unlock Gaara and Temari do single-player with Shikamaru

Orchimaru-Guy Sensais single mode or kakashis
Itatchi-tenten-beat rock lee vs neji mission on jonin
And complete saskues rematch with itatchi mission on jonin and chunin
And genin

Here is a list of the things you can unlock and how!!!

Mini-Games
To unlock you must get a highscore on the previous Mini Game.

Shadow Clone Jutsu
Get a highscore on 'Shuriken Training'.

Rasengan Training
Get a highscore on 'Shadow Clone Jutsu'.
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Characters
To unlock anything you must complete Missions 1-19 (not including 13.5).

Kankuro
Beat missions 1-19 for the first time.

Garra
Complete Single-Player with Naruto.

Temari
Complete Single-Player with Shikamaru.

Tsunade
Complete Single-Player with Jaraiya.

Shino
Complete Single-Player with Kankuro.

Hinata
Complete Single-Player with Neji.

Ino
Complete Single-Player with Sakura.

Orochumaru
Beat Single-Player with Kakashi after completing Mission 23.

Itachi
Get a high enough score on Single-Player Mode.

Kisame
Get a high enough score on Single-Player Mode.

Guy
Beat Mission 13.5

Tenten
Beat Mission 20.
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Missions



Mission 13.5
Beat Missions 1-19.

Mission 20
Beat Single-Player Mode with Neji and Rock Lee.

Mission 21
Beat Single-Player Mode with Naruto.

Mission 22
Beat Single-Player Mode with Sasuke.

Mission 23
Beat Mission 22.
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Difficulty 4
Beat 30 battles straight in Survival Mode
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Survival Mode
Beat Single-Player once with any character.
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Character Audio
Beat Time Attack Mode with a respective character to unlock their audio(Example: Win Time Attack with Naruto and you get Naruto's audio)
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Thats all,
PhilXZ