Insanity With a Dark Side

SO even though I wasn't a huge part in zombie apocalypse, since my characters would still be at camp I think they would still be shaped by it. I spent a large time period thinking about it, realized if Chris got any darker, I'd have to kill him, and I like him. Caleb wouldn't be affected a lot by it, he'd get over it and carry on as usual. So now I have Theo, who lost it a while back. I think I've decided the apocalypse is kinda gonna snap him back to reality, but in a bad way. He's just going to become merciless and dark and cold, with a little insanity mixed in. Kinda like a monster inside. So anyone want to witness the down hill Theo?