So for those that watch this show. Did you watch the holiday special? What I'm most curious about is this. When you see the Ice King with the crown and his odd transformation if you look out the window behind him you can see the world change with him. So what I want to know is, is the Ice King responsible for the extinction off all humans and the state of OO now?
Not sure if the little kids would have realized how truly sad the episode was, but it seems the Ice King's origin was extremely tragic. Had everything good in his life taken away by the crown, yet it saved his life and keeps him oblivious to all the tragedy that has befallen on him. Other than Finn, he is utterly alone.
Now, he's a prisoner of his mind, hanging on his past existence through a constant need to find his princess. A need he'll never understand, for if he finally realizes the truth, it will utterly crush him.