Gobber is the town's blacksmith. He is in charge of creating weapons for the Vikings to use when facing off against dragons, and isn't afraid to go against dragons himself. He lost his hand and leg to the dragons years ago. And one more thing: Hiccup is his incompetent apprentice.

Gobber seems to understand Hiccup pretty well, and isn't at all embarrassed by him being unable to fight dragons. In fact, he seems to see Hiccup's weakness as a gift, perhaps one that could come in handy. 

He is in charge of training young Vikings to fight dragons, and is very surprised at Hiccup's progression. When it is revealed that Hiccup has a dragon named Toothless, Gobber doesn't seem to be too surprised.

He fights alongside Stoick in the final battle of the film, risking his own life to save the rest of the Vikings. He also makes a prosthetic leg for Hiccup after the latter loses his in the battle.