Wait, this dude again? I thought he was 'leaving Karen's fate to the MC because he has the power to blah blah...". The MC should just use him to get rid of his annoying yandere houseghost, but I doubt he'd think of that. I expect the next chapter will be an exposition dump, explaining why greenhead is doing what he does, and eventually giving the MC a timed ultimatum to help Karen cross to the other side, or he will do it himself. This guy has to be some kind of angelic or demonic being, maybe even some sort of grim reaper. I have to admit though, we're not even to the halfway point in this series, and it's getting kinda stale with the continuous cockblocking, lol.