Author

I believe the Host/Author Mark(iplier) is behind all of the Iplier lore. Yes, meaning Wilford Motherloving Warfstache, Who Killed Markiplier, A Heist with Markiplier and so on. Now, this is just what I think. Years ago, this was my theory and it seems to be revamped. Why did I believe this at the start? Well, knowing The Host and how he likes to stay hidden. Since, he is an author and basically his type of genre from Danger in Fiction revolves around the horror type genre. To save you having to read so much, I'll bullet them.

The ever so suspicious narrator.

There is a scene in there (I can't remember though.) where in the captions it says something along the lines ''Damn. My pen, hold on.'' which in Danger in Fiction he writes his stories.

Just as in Danger in Fiction, the ''evil entity'' which was chasing Daniel could be too, referring to ''them'' and ''it'' that was mentioned by the unknown narrator in In Space with Markiplier.