2. Tyreese (And Sasha)
Although he was introduced much later on the show than he was in the comics, Tyreese might be in trouble already. He is clearly set up to be a key player in season 4 of the show, and from what we've seen he will definitely be given ample opportunity to do some serious walker head-bashing with his trusty hammer. But then what? Are they going to play up the leadership power struggle between him and Rick from the book? Doubtful, since the show's version of Tyreese has been much more passive with Rick and the Governor. So far, he's simply been a survivalist trying to fit in to whatever group will take him and Sasha in. He had a turning point towards the end of last season, but I don't see his character really growing beyond that. Don't get me wrong, I want to see Tyreese survive as long as possible. Like Michonne, he is a fan favorite from the comics because he kicks ass. But he is also brutally killed by the Governor at the end of the prison arc, so based on the timeline alone he should already be dead. The chances of his partner Sasha surviving this season are even slimmer.