Bahaha, I like. Love the messed up teeth on the Z.
Not a huge fan in general of the wide-crotch look, though. It's bearable on the first three guys, but really overdone on the biker. I might also suggest making the glasses on the first guy taller by a pixel, just so they clearly read as such. Weapon-wise, glasses guy's top-view pistol grip is a bit weird, mainly because his straight arm is tilted so far center. For something with so few pixels to play with, I'd either go full-on isosceles (both arms straight out), or a weaver grip (similar to the Chapman, but both arms remain bent). If you go with isosceles, though, I'd still recommend offsetting the right foot backwards a pixel or two.