Hiccup was weird, not only was he a hiccup he also possessed the gift of dragons. No one knew who, or what, he really was. When he is chosen to Kill the Nightmare he ran away, knowing he wouldn't be able to kill the thing that he was, and found he wasn't as alone as he thought he was. But later he learns that if his past is to survive, he has to return to Berk...like it, or not.