Hiccup and Toothless

Hiccup:In the first film, Hiccup's appearance is very similar to his book counterpart. He is rather scrawny compared to the other Vikings, and is only 5’1”. He initially has little physical strength, as he has difficulty lifting a large standard battle axe handed to him by his father. He has bell-shaped auburn hair parting to his right with freckles on his cheeks and dull, green eyes. One of his more unique traits is a small scar on the right side of his chin, which he received as an infant the night Cloudjumper took his mother to the Bewilderbeast’s nest.

In the first film, he is seen wearing a long-sleeve, light-green woolen tunic with brown leather lacing at the neck and arms, a dark brown fur vest that matches his boots and dark greyish-green pants with lacing at the ankle. When he's working in the Blacksmith Shop, he removes his vest in favor of a beige smelting apron. When he rides Toothless, he eventually replaces his vest with a leather flying harness that attaches to Toothless' saddle. Once he begins Dragon Training, he starts to wear a Viking helmet given to him by his father. Following the battle with the Red Death, Hiccup's left leg up to his mid-shin is replaced with a prosthetic, constructed with a spring system and an adapter stirrup for flying with Toothless. This event deepened the connection between Hiccup and Toothless, both of them now have a prosthetic left appendage.

If observed closely, it can be noticed that he's slightly taller in Dragons: Riders of Berk. He's still wearing the same green tunic and pants from the first film, but he's now wearing a suede vest with Nordic designs embossed at the hem and front closure, and a matching suede boot. His hair has grown slightly longer by Dragons: Defenders of Berk showing the passing of time.

In Dawn of the Dragon Racers, Hiccup wears dark brown leather armor over a long-sleeved green tunic, with brown arm brackets and double-layered shoulder guards (one of them has a Berk Dragon Training Academy symbol on the right shoulder), and dark reddish-brown pants. In Dragons: Race to the Edge, he wears the same armor and the same pants, but has switched to wearing a red-orange tunic instead of his green one.

Toothless:Toothless has black scales covering his whole body, his sides having small light patches in a pattern similar to that of a manta ray or even a black panther. Toothless also possesses two sets of wings (one main pair and one smaller pair near the base of his tail). He is missing the left side of his tail-fin, which he lost when Hiccup took Toothless down with his Mangler Cannon. This is later replaced by a mechanical fin that Hiccup constructs himself.

Toothless has a rather large scar on his right shoulder/neck which is around a foot in length with a width of about an inch. He also has two scars on his left front leg as of the fourth season of Dragons: Race to the Edge and How to Train Your Dragon 2 due to a fight with a Razorwhip dragon, where he was slashed by its tail. His eyes are bright green and are located very near the front of his face 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 has two extremely large wings that allow him to do vertical takeoffs and landings. Behind that is a set of smaller wings that aid in gliding and soaring. At the end of his tail he used to have yet another set of wings that aided in steering and stability, but his left one is now missing and has been replaced by a mechanical tail fin provided by Hiccup.

As shown in How to Train Your Dragon 2, the spines on his head and forelegs have become slightly longer (most likely with age). He also has three new sets of extra plates growing on his lower jaw. He is also revealed to have a set of extended spines running along his back that aid him in making tight turns. Toothless didn't know about them, as no other Night Furies were around to show him this ability, but they were revealed by Valka, Hiccup's mother. Toothless is also a lot more playful than he was in the first film, likely due to his extended time with Hiccup. It is also revealed by Valka that Toothless is the same age as Hiccup, being twenty-three years old. This may be another reason for how well the duo get along so well.

As a Titan Wing Night Fury, Toothless gains blue markings on his body when at full power, with those markings on his spines and head glowing. Toothless appears to have grown slightly larger in this form. The blue markings on Toothless' body which he gains when at full power, might be a possible reference to another Reptilian creature, and the King Of Monsters, Godzilla. Because when Godzilla charges up his Atomic Breath, his dorsal plates glow a Light-Blue hue. But instead of a fireball, Godzilla fires either a straight beam (also known as an Atomic Ray), or a fire-looking Atomic Breath, depending on which MonsterVerse Version of Godzilla you are thinking of.