Swiffo was Skor Axehound's youngest son, and the brother of Ruggan Axehound. He was more of a peaceful nature than the rest of the sea otters, and joined up with the Fortunate Freepaws as a scout. He led Posybud, Uggo Wiltud, and the Freepaws through a marshland to escape Razzid Wearat and the crew of the Greenshroud, and convinced Sircolo to aid them in their journey. When Uggo and Posy left the Freepaws to go with the Guosim to Redwall Abbey and fight Razzid, Swiffo went with them, his reckless sea otter nature finally getting the better of him.