I Love toothless, and I love how he always suprises "us", and hiccup( as said in "How to train your dragon 2") The animators themselves said that Toothless was supposed to be a mix of all the pretty things with every dragon animated in the movies( not from the books).
Originally Toothless was a lot bigger, but because he needed to be cute, an "reflect hiccups soul" He got a tiny body, and a more soft face, whom can easily turn into the deadly,scary dragon we see when he is angry, protectiv or in a fight. I love Toothless, and all the other dragons. But I see myself in Hiccup, thats why I know I would have contected to that dragon type. Night fury NERD forever! <3