Gandalf
Gandalf, who actually doesn’t have much to orchestrate in The Hobbit. He is a Maiar and becomes one of Bilbo’s closest friends at the climax. During Bilbo’s adventure, he spends much of his time at the White Council where he learns from his fellow Maiar Saruman that the One Ring presumably was washed down to Belegaer. He later returns to save the Elves, Men, Dwarves and Bilbo from destruction at the Battle of Five Armies.