Slippy was a mischievous otter dibbun that was little brother of Slimbrook, and nephew of Skipper. He was best friends with Tibbles and Bolo and was leader of the three. He loved swimming and playing. Upon hearing that there were vermin about in Mossflower, the trio set off to fight them. They were then captured by Wisp and brought to Syzran, who the young otter was afraid of. All three dibbuns were retrieved safely back to Redwall by Alderjack, Treescamp, Horlington Bradshaw Vittlescoff III, and Slimbrook.