Nell Fenwick: Dudley's romantic interest, a beautiful young woman who is often kidnapped by Snidely Whiplash.
Snidely Whiplash: The main villain of the series, a villainous cowboy who is constantly plotting to capture Nell and take over the Northwest Territories.
Horse: Dudley's loyal horse, who often helps him in his adventures.
Chief Inspector Fenwick: Nell's father, the chief inspector of the Mounties.
Constable Benton: Dudley's bumbling sidekick.
The Ant Hill Mob: A group of outlaws who are constantly causing trouble for Dudley.
The Klondike Kid: A young prospector who is friends with Dudley.
The Royal Canadian Mounted Police: The law enforcement agency that Dudley works for.