You can now use Lars.

You've acquired S Rank in "Earth Shatter".

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've picked up 500 items.

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".

You've acquired S Rank in "The Bell-Stealing Drill".

Acquired the Ancient Sword.