Quickbill was a male magpie in General Ironbeak's army, and the brother of Diptail and Brightback. He was the leader of the three siblings and the strongest.
He and his brothers were used in foraging and scouting missions, serving as the primary supply line for the army. Recognizing this, Constance and several others were able to temporarily capture the magpies for an exchange of hostages.
In the final battle, one of the magpies was killed and the other two were captured. Later, they were freed and ordered to fly back to the Northlands (or at least away from the Abbey) under the watch of Stryk Redkite.