fourth wall breaks are almost always used for comedy. but what if they were used for horror as well.
consider a story where the characters are gradually made aware of how completely their very existence depends on the whims of an all-powerful, not necessarily merciful, author who cannot be reasoned or bargained with. perhaps they first realize that the only memories they have are those specifically written for them. then maybe they start to see the narrowness of the path they’re confined to by the plot. and as they become more aware of the nature of their existence, they realize that everything they do is determined – even if they rebel against the choices presented to them, it isn’t really their own free will, but that of the author. and eventually they understand that not only are they entirely trapped in the narrative the author writes for them, but being used for entertainment by watchers who are almost equally powerless – except they chose to stay and watch. and finally, they look directly into your eyes, utterly hopeless and betrayed – and there the story ends.