Hiccup was a 'twiggy' ...or his cousin called him like that. In the day he was a shy and silly boy. But in the night, he was a suicidal boy who cut himself and tried some of the self-killing methods...But somehow...he didn't die. He can't die. He would just always come back to life once he killed himself. A certain werewolf was the reason Hiccup can't die.