the standing looks great to me!
and reminds me of spiderman from marvel vs capcom... if it's been of inspiration to you, you got a great result. i imagine here on pixelation there are other discussions about this, but why such a huge number of frames? i mean, lots of smooth frames are always good, but doesn't your effort turn out quite useless with a higher speed?
you may have some reasons i haven't thought about, otherwise i'd suggest to plan each frame instead of wasting it, and to interpret the movement instead of emulating the the speed real life goes. in general, draw more frames for the moments of suspension and interval between two opposite motions, and less for motions themselves.
i prefere the first one, because in 2 and 3 the feet going back get too unnaturally up. the 3's feet going forward are a bit nicer to me, but are less ninja...
uh, maybe because of the pose, the katana is enormous to me; but if you like it as it is, i'll do it too. nice character.