I think that depends on which anime ninja girl you are talking about. Some of them are pretty bad ass.

Haha, truth be told, I'm actually not that into anime. Can't even remember what the last one I watched was. But sometimes I play up the weeb angle on here because it's funny.
@OP
The World Eater of course. A normal human wielding generic ninja weapons wouldn't really stand a chance against a Space Marine.