Bunson was a Mastiff purchased as a puppy by Azimuth Andrea Almanac Caspian Kelshplotter  from a dog breeder in Little Lockford, acquired in part for the sturdiness the breed was known to provide on long expeditions through the Deepways. He grew into a large and steady animal, well suited to the demands of cavern travel, and accompanied Azimuth on nearly every survey undertaken in the years that followed. Where the shifting passages of the Undermire made most Gnomes uneasy, Bunson proved unflappable, and Azimuth came to rely on his instincts as much as his own cartographic experience when navigating routes that no map could be trusted to describe for long.

Beyond his usefulness on expeditions, Bunson was, by most accounts, Azimuth's most constant companion in the years following his relationship to Tixie Taffebeser Tockworth, present for both the isolation that followed and the criminal work Azimuth increasingly turned to in service of his family's debts. Despite his general good nature, Bunson had little tolerance for strangers who came too close to his master's belongings, a trait that proved useful more than once in Azimuth's less reputable dealings.