Answer: Balin
Balin offers a great amount of wisdom and guidance as the oldest of the company. As seen in the prologue of the movie, he makes an appearance in the battle for Erebor when Smaug the Terrible is shown attacking the dwarves of the Lonely Mountain. Played by Scottish actor Ken Stott, this dwarf is seen in the movie explaining things and helping others understand many issues within the company and illustrating past stories. Balin is also one of the dwarves who are mentioned in the "Lord of the Rings" trilogy. Later, after everything that happens in "The Hobbit", Balin returns to the Mines of Moria to reclaim it. In the "Lord of the Rings", his tomb is seen, on which is written "Balin, son of Fundin - Lord of Moria".