I'd take the ability to manipulate vectors, as used by Accelerator from the light novel/anime series A Certain Magical Index.
Any vector. Anything that can be expressed as a magnitude and a direction, I can manipulate it. Which is basically every single force you can imagine. It's essentially the omni-power. In the context of that series, it can even shut down teleporters, because apparently teleportation works by 8th-dimensional vectors or something like that. Plus it comes with an auto-invulnerability mode, in that the default, reflexive setting (which functions even unconsciously) is to reflect harmful vectors.
Hypothetically, that could even apply to time. Not sure if that's been adressed in the series or not -- I know it hasn't been done in the anime, but my knowledge of the light novels is pretty sketchy.
The one downside is that you wind up pretty pasty-looking and need to make sure you get plenty of vitamin D in your diet, since the automatic defensive side of the power blocks all UV light
For a slightly less ludicrously hax power, I'd take telekinesis. It's pretty versatile -- you can fly, shoot mind bullets, stop regular bullets, get that book from across the room without leaving your comfy spot on the couch...
Any vector. Anything that can be expressed as a magnitude and a direction, I can manipulate it. Which is basically every single force you can imagine. It's essentially the omni-power. In the context of that series, it can even shut down teleporters, because apparently teleportation works by 8th-dimensional vectors or something like that. Plus it comes with an auto-invulnerability mode, in that the default, reflexive setting (which functions even unconsciously) is to reflect harmful vectors.
Hypothetically, that could even apply to time. Not sure if that's been adressed in the series or not -- I know it hasn't been done in the anime, but my knowledge of the light novels is pretty sketchy.
The one downside is that you wind up pretty pasty-looking and need to make sure you get plenty of vitamin D in your diet, since the automatic defensive side of the power blocks all UV light

For a slightly less ludicrously hax power, I'd take telekinesis. It's pretty versatile -- you can fly, shoot mind bullets, stop regular bullets, get that book from across the room without leaving your comfy spot on the couch...