The foreboding project is not an entities addon, I stand by that. But that doesn't mean there aren't ways entities can be added in an inconspicuous and mysterious way or as a playthrough branch.
I have been working in the foreboder above for a while now, from the idea in the paper to the AI and code implementation. I think is coming along well.
Don't expect to see this guy in a regular playthrough, you will really need to diverge and do stuff to see him.