Guard-captain Unnarr is first met as a member of the dwarvish expedition to Skorgrim's Tomb. He is met again during the current period when he is Captain of the Guard of Thorin's Hall, and can be found in front of the large statue at Frerin's Court.
During the During the Elvish/Dwarf expedition to Skorgrim's Tomb Unnarr is one of the throng of Dwarves participating in the expedition. He has not yet acquired his later title.
He stands watch over the sickened Olin scratching his neck and waving his hand.
-  Dogs of Death - Intro Optional
Guard-captain Unnarr is met after the expedition, now promoted to Guard-captain.