Toothless

Toothless is the dragon that belongs to Hiccup and one of his best friends despite it's inability to talk

Toothless appears as a Night Fury in the film, the rarest and most intelligent species of dragon there is.

He has jet black scales covering his whole body, his sides having small light patches in a pattern similar to that of a manta ray. Toothless posseses at least two sets of wings (one main pair and two smaller ones near the base of his tail). He is missing the left of his tail fin, lost when Hiccup takes Toothless down with his Bolas-Shooting Ballista. This is later replaced by a mechanical fin that Hiccup constructs himself. Toothless' eyes are a greenish-yellow. He can narrow his pupils to slits when threatened or angry, similar to that of a cat. But when he is docile or happy, his pupils become larger and more dog-like. Toothless gets his name from his sets of retractable teeth.

Toothless is very intelligent and seems to have a dry sense of humor, similar to Hiccup's. He does not take kindly to being offended or anyone offending or endangering his human friend, but is usually playful, docile, maybe even a little teasing when not threatened. He also shows a great curiosity, imitating Hiccup's actions and mannerisms when they initally encounter one another like when he was observing Hiccup draw him, he then tries to draw with a tree branch. Toothless' intelligence shows many times such as being 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 crush on Astrid, even seeming to briefly tease him about it. He proves himself to be a very able fighter, such as when he rushes to Hiccup's aid in his battle with the Monstrous Nightmare, Toothless quickly causes the larger dragon to back down. Toothless also shows himself superior to most Vikings, as proven against Stoick in a quick skirmish.