The unnamed Grumpy Watervole was a mean-tempered, unkind watervole who lived along one of the River Moss's tributaries. After Orkwil Prink was banished from Redwall Abbey, the watervole refused to give the hedgehog food or drink, aimed an arrow at him, and tricked him into doing subservient tasks before sending him into the wilderness. He was captured by the crew of Vizka Longtooth and used as bait for the Redwallers. The watervole was knocked out cold by Benjo Tipps, repeatedly insulted, forced to answer questions from Rorc, threatened by Orkwil, and knocked aside by Gorath.