Technically speaking, in the uncannon Reality there is 3 main entities(check comments)

Hmm

There's also third person limited, where the author knows everything but only about one character or a select group of characters

*narrator

Yeah

Hey, two spots left.

So basically outside of cannon there are these 3 entities.

The Story Ruiner, well, ruins stories and drags OCs into the uncannon realm if necessary.

The Narrator is the narrator used in the stories created. The Narrator can become any character (first person narration or third person but the perspective is inside the story)or be completely outside the story(third person narration and usually knows everything that happens, everything that a character is thinking)

The Authors are us. We have the power to change the story and to command the Narrator and the Story Ruiner.

But the Narrator can't really fight anyone. So he id technically the strongest being because he knows everything (if the author gives him the knowledge) and controls time of the story and the place(it's decided by the author where the story happens, but the narrator decides how and when it wilk show that place)

The Story Ruiner like the narrator but more rudimental.
He just follows the Authors' commands.

The Author can't fight, but it can decide the fate of the story.