Bilbo Baggins is the main character, and I would cast James McAvoy as Bilbo, because the book describes Bilbo(and Hobbits in general), with these quotes: “They are (or were) a little people, about half out height, and smaller than the bearded Dwarves. Hobbits have no beards.”(pg. 4), “[they] have long clever brown fingers, good-natured faces, and laugh deep fruity laughs.”(pg. 4), and “[they] wear no shoes, because their feet grow natural leathery soles and thick warm brown hair like the stuff on their heads (which is curly)”. He would fit the role well because he is Scottish, which is what I imagine the people in the book sound like, and he is of average height, which helps to look more like a hobbit (in post)
I chose Gandalf as the Sidekick, and I would cast Richard Harris (when he was alive) as Gandalf, because in the book Gandalf is described with these quotes: “He had a tall pointed blue hat, a long grey cloak, a silver scarf over which his long white beard hung down below his waist, and immense black boots.”(pg. 5), “All that unsuspecting Bilbo saw that morning was an old man with a staff”(pg. 5), and “Not the Gandalf who was responsible for so many quiet lads and lasses going off into the Blue for mad adventures?”. He would fit the role well because he played Dumbledore, who is a very similar character to Gandalf (wizard, tall, old man, wise). He would also nail the old wizard beard perfectly.
For my other character, I chose Thorin Oakenshield, since he is the most memorable and interesting of the Dwarves to me. I would cast Luke Evans as Thorin, because Thorin is described in the book by these quotes “This last belonged to Thorin, an enormously important dwarf ” (pg. 11), “Thorin indeed was very haughty, and said nothing about service…” (pg. 11), and “This was Thorin’s style. He was an important dwarf. If he had been allowed, he would probably have gone on like this until he was out of breath, without telling any one there anything that was not known already.”(pg. 17). I chose him because he auditioned for the role of Thorin in the movie, and lost to Richard Armitage, so he clearly had a passion to play this character. He also has a hard face and chiseled jaw, which would fit the “super important dwarf”.
For the villain, I chose Smaug, because he is the main villain for a while in the book. Since he is a dragon, I would voice him with Alan Rickman (when he was still alive), because in the book, Smaug says these things: “My armor is like tenfold shields, my teeth are swords, my claws spears, the shock of my tail a thunderbolt, my wings a hurricane, and my breath death!”, “His rage passes description – the sort of rage that is only seen when rich folk that have more than they can enjoy suddenly lose something that they have long had but have never before used or wanted.”, and “I kill where I wish and none dare resist.” Alan Rickman has the perfect evil voice, which would keep Smaug intimidating. He would keep everyone involved in the movie.