I think it'd be better to have main characterS rather than one central one.

I have some rather niftular weapon ideas though. Very many. They're combinations of energy, projectile and good old fashion sharp object weapons. So whilst the whole high-tech 'my laser is bigger than yours and my gun is louder' thing is cool, there could also be the foot people running up to an enemy armoured suit and going 'ha, I stab your foot with this EMP-discharge bayonet' (it's a weapon idea...normal bayonet that discharges EMP into mechanics to disable vital systems...bleh I'm rambling..).