This particular miniature Goblin worked as a scribe and a messenger for the Great Goblin in The Hobbit: An Unexpected Journey film. He records events in Goblin Town. He is a tiny goblin with malformed legs. He uses his long finger nail to write with and uses parchment to write on. If you look closely, his legs are deformed and withererd. Because he cannot walk, he must get around on a pully with a seat attached to it.
In The Hobbit: An Unexpected Journey Chronicle, the Goblin Scribe is described as the Great Goblin's son from some marriage he'd prefer to forget, so he gave him an administrative job away from the throne." He is in the movie for a short time but seems to be a popular character. Also his nose is slightly higher than his eyes giving him a very unique, almost "cute" look.