Ninjas did use katanas...
You think I know that? I was just making it easy and not using sophisticated names like katana, or sai.
First off, samurai swords are called katanas, and second, "ninja swords" dont exsist because ninjas were assasins have to be stealthy, and katanas are large and hard to hide. You would most likely find a ninja wielding sai (sai are the 3 pointed dagger looking weapons, with 1 long point in the middle and 2 short side ones. But this is still great, so +1.