Rizzo was a soldier in Syzran's Horde and friend of Bloodtooth. He was large for a rat, but still smaller than most weasels, ferrets and stoats. He and Bloodtooth were sent out to spy on Redwall and gain information to Syzran. Alderjack and Treescamp stopped the pair and beat them up, then went on to Redwall. He attempted to climb the Abbey Wall to assassinate Abbot Arstead, but was kicked right off the Wall by Captain Fleetrun's strong hindpaws.