Toothless is the name of Hiccup's dragon in the How To Train Your Dragon film franchise and is the one of the main protagonists alongside his rider. Unlike his book counterpart (there's a book???), Toothless is a Night Fury, one of the rarest and most intelligent of dragon species. He is presumed to be the last living Night Fury in the world, at least on Berk or the surrounding isles in the Archipelago. Having initially been shot down by Hiccup during a dragon raid, Toothless is nursed back to flying shape and becomes Hiccup's best friend through their interactions.
Toothless has jet-black scales covering his whole body, along with two sets of wings. He is missing the left side of his tail-fin, which he lost when he was shot down. This is later replaced by a mechanical fin that Hiccup constructs himself along with a saddle and the appropriate apparatus to control the fin. He also has a rather large scar on his right shoulder/neck which is around a foot in length with a width of about an inch, though how he acquired it is unknown. His eyes are a bright green, located near the front of his head and giving him excellent depth perception and reflexes in flight. He can narrow his pupils to slits when threatened or angry, similar to that of a cat. However, when he is docile or happy, his pupils dilate and become more dog-like. Toothless gets his name from his sets of retractable teeth.
Toothless is the most intelligent of all the dragons and seems to have a dry sense of humor, similar to Hiccup's. He shows a sense of great curiosity, imitating Hiccup's actions and mannerisms when they initially encounter one another and is able to understand Hiccup's words and commands as well as agree with some of what he says. It is shown that he has become aware of Hiccup's relationship with Astrid, even seeming to briefly tease him about it.
Toothless is the perfect "cute" dragon, and reminds me of a cross between a dog and cat. He looks like a cat, but acts like a dog. But then he can fly and breath fire, so that's bad ass. He also acts super playful in the movie, and you can't help but love him. Even though I personally would prefer a large intimidating golden dragon, this guy is one of my favorite dragons.
How to Train Your Dragon is definitely my favorite dragon movie of all time. There, I said it. Now go watch it if you haven't. Seriously. You will cry. And love dragons.
"I looked at him, and I saw myself."―Hiccup describing his relationship with Toothless.
"You never cease to amaze me, bud. Thank you..."―Hiccup, sharing a moment with Toothless