I myself would love to play Base Raiders, or any other super hero Role Playing System.
For a system (I cannot remember which), I had a character who could solidify and shape any visible energy. So, Electricity, Light, and Fire. I called him Chromatic.
So, there were these 3 large spider robots who invaded central park. My character rolled high enough to encase them in a barrier with a curved top, so they couldn't crawl out. Then everyone proceeded to attack them through some holes in the barrier.
They exploded, and somehow we ended up in the future in an alternate timeline.
We were quickly picked up with what amounted to SHIELD. I managed to freak them the fuck out as I managed to bring weapons past their weapon scanner.
Then that is where the game ended.
....now I want to play a 'ghost' character who creates bodies for himself from surrounding matter/possessing things. Possibly temporally binding other spirits to do the same. I'd call him Shell. (Points for whoever gets the reference).