Hmm. This could go a few different ways. One is to point out that, when I was trained, Legions tended to not have anything comparable to this world's scattering of training centers for various martial arts. Everyone got trained the same, and if you wanted to be some sort of combat virtuoso you largely had to figure out how to do that on your own. Nobody got clearance to go train in the mountains of some desolate planet until they learned kung fu. In short: N/A (a boring answer).

Then there's the option to use a liberal definition of "martial art," which is to say that if waging war is an art form, then what medium do I favor when crafting masterpieces? The simple answer is any technique that completely ignores the war of flesh and machinery and reaches directly for the human heart or spirit. Memewars, psyops, raw charisma--these are very much my preferred weapons of choice, usually with music as a vehicle. It's not really possible to take whole planets bloodlessly where I come from, but it's rather nice to have them fall after only a token scuffle with minimal casualties.

And if you were talking specifically about this world's martial arts, then...my friend tells me that there's one focused entirely on throwing knives and bullwhips that sounds quite glee-inducing, if I had to pick just one. X3