@Fiery Fastball

While the quality of your SU isn't bad, I see multiple problems, but really, most of it comes down to the fact that everyone is supposed to start off as a Cloud's Cross native (all of whom have been sealed away from the rest of the world for 15 years), and that the apocalypse has already happened. Eric would likely have difficulty finding creatures of the night to have a soft spot for, let alone know he had a soft spot for them. He wouldn't be able to just flee to Cloud's Cross, even if he knew where it was, he would have quite the time getting in, and then he'd have even more trouble hiding from the adults there...who would freak out if they knew he was there, as well as the fact he just seemed to have developed powers out of nowhere. Bouncing from Christian Mission to Mission would be highly unreasonable, as the world above Cloud's Cross...well, it isn't very pretty. Those few still alive aren't very welcoming, and it would make travel difficult and dangerous (as the kids will eventually find out themselves). I'm also not quite sure about the miasma flatulence.

So unfortunately, I can't accept this SU as of right now. Feel free to make edits and let me know when you're done.