As I posted in the other ninja + scout theard in general discussion.

Ninja will be available to everyone or only to those who cleared the main story?
New guy, gets home, install the game, starts brand newie...can he be a rogue -> ninja? wouldn't that create a plot paradox?
Lady Yugiri doesn't get here until you clear Prae and move on with the main story....how would she train a fresh 30 when she hasn't even got here in that guy story?