I'd like a flamethrower/flare gun combo, including air compression blast.
I can see it, Horror-movie wise.
Someone walks into a walk-in freezer, and I melt the door shut. Someone throws a chair at me, reflect it back, gets knock down dazed, Drag him back to the "Fire-House", strap him in, set down the flame thrower and grab a acetylene torch and torture him with it, Hero-chick come in, knocks me out with a wrench, drags the guy out, i wake up shortly after and grab the flamethrower, modify it with the same wrench they're running outside to their car, and blow fireballs at them....
...Sorry, Fantasies of film-making on G-Mod go through my head.