Dori, Ori and Nori are but three of the thirteen dwarves to be principal characters in The Hobbit. Nonetheless, our first look at these characters tells us a lot about Peter Jackson's visualisation of the dwarves in the film…
a lot, which can mainly be summed up as "just like in his Lord of the Rings films."
Which is actually something of a surprise, as the dwarves in Tolkien's book are, on the whole, more colourful and chipper sounding than Gimli ever was.
The following comes from Warner Bros., and serves as their official introduction to the characters:
These three brothers, all sons of the same mother, could not be more different from each other.
Dori, the oldest, spends much of his time watching out for Ori, the youngest; making sure he's not caught a chill or got himself killed by Wargs or Goblins.
Nobody quite knows what Nori gets up to most of the time, except that it's guaranteed to be dodgy and quite probably, illegal.
Dori, Nori and Ori are intensely loyal to each other – and whilst they are perfectly happy fighting amongst themselves, woe-betide any anyone who means harm to one of these brothers.
If you don't recognise the actors under all of that dwarf-face, it's Mark Hadlow as Dori, Jed Brophy as Nori, and Adam Brown as Ori.