Deadpool (Marvel) is aware that he is in a comic book and able to express his thoughts via captions.
Be aware of the 4th wall.
The ability to be aware that one's Universe is fictional, and potentially use this to act in otherwise impossible ways within their fictional universe.
Fourth Wall Breaking
Users have the capacity to be aware that their Universe is false. Through this, they may be able to carry out acts that, within the Universe, would otherwise be impossible. Depending on the extent of the user's power, one could potentially gain the powers of Reality Warping and/or Omniscience within the context of their own false Universe.
People that use this ability may appear to be abnormal to every one else, and it may be difficult at times to hide the fact that you have this ability. Coupled with their potential influx of wild information, users have an increased likelihood of being driven completely insane.