Runn was a mischievous male Dibbun otter of Redwall Abbey. He was the twin brother of Bagg and a good friend of Grubb. He, his brother, and Grubb saved the Abbey from the searat crew of the Darkqueen by using Friar Alder's best chopping knives to cut the rats' grappling hooks on the north wall of the Abbey and stop a siege against Redwall. It was Bagg and Runn who brought Aubretia and Bultip to Redwall.