right now i am studying the art of ninjitsu and there is no honor in what we do but there is glory and we where used for assasinations and lead sneak attacks (raids) during war. the greatest ninja ever was a sect that most people know very well. And this isnt just from the game. the Iga ninja where very stealthy... so ya its them the Iga ninja
"Bankai, Tenza Zangetsu!"
"This is my way of the Ninja"