Bagg was a mischievous young otter Dibbun resident of Redwall Abbey during the time of Abbot Bernard. He was the twin brother of Runn. Bagg, Runn, and their mole friend Grubb saved the Abbey from sea rats by using Friar Alder's best chopping knives to cut the rats' grappling hooks on the north wall of the Abbey, which stopped a siege.