Reading through this gave me an interesting idea. Hope you like it Klaus. Let me explain it though.
I was thinking an amped out guitar that put out such wicked vibes that some notes would cause people's heads to explode like in Tenacious D. The other notes you'd actually melt people.
And best of all, if you have the guitar equipped while using the grappling hook - instead of uppercutting them, you'd KA-TWANG them with your guitar like in FLCL!
Suggested name: Über Guitar
Also thinking about a jello gun to work along side the freeze gun. It would basically encase them in a big jello jiggler, and the speed that they would come bouncing at you would be completely based on their momentum. Sort of like a snare instead of a stun?
How come no one mentioned the railgun yet? Since it's not such an innovative idea, why not have it only for the guy's backup, and he'd taunt out Arnie by pretending to be on set for Eraser 2 (tee hee). Imagine what that would do if you set one of the jello jigglers on fire with a flaming chicken and then hit one of those! Exploding jello with feathers!
I think what I'm really saying here is I want to see more than one ammo type for each weapon. Why wouldn't the disc launcher be able to hold cd's, circular saw blades, dishes, or even clay pidgeons (where you shout PULL and then all the enemies stop and try to shoot it...lawl)? Or even the grappling hook could be upgraded to a chain, then spider silk, then the TRACTOR BEAM.
Sorry. I hate when I ramble. :P