You can now use all members of the Akatsuki.

You've cleared Chapter Six.

You can now use Jiraiya, Tsunade and Orochimaru.

You've cleared Chapter Four.

You've cleared Chapter Three.

You've acquired S Rank in "Showdown Between Best Friends".

You can now use members of Naruto's generation.

You've acquired S Rank in "Sakura Dances".

You've acquired S Rank in "Sand and Art Blast".

Play 5 consecutive Head to Head Ranked Matches without losing

Crack the code.

Use the Grim Reaper to destroy the MG emplacement.