Ohhhh, I like 8,9,10,and 11 the most, due to the lighted-up weapons and the "action" feeling those have. On the whole though, your lighting has gotten better over the years, and all these appear basically soundly-lighted and shot.
I usually go to about 2 or 3 cons a year, so that's about how often I'll be posting these kind of shots.
My favorites are 9 and 11.
9 was part of an extended outdoor shoot at night using color gels on my flashes. Made the lightsaber look more Star Wars in Photoshop. And 11 was just a quick hall photo but I like how it turned out. He had a good pose and it was easy for me to composite and add the glowing effects to the guns.