Piknim was a young female mouse resident of Redwall Abbey. She was the best friend of Craklyn and also good friends with Tansy. She assisted Rollo and the others in solving the riddles associated with the Tears of all Oceans.
Piknim and Craklyn were active, agile, and loved to race each other. They would often use the search for the pearls as an opportunity to challenge each other up or down the stairs and throughout the Abbey.
Piknim was murdered by jackdaws living in Saint Ninian's Church as she was trying to recover one of the pearls. Her unexpected death caused great grief for the entire Abbey. She was buried by Auma and Rangapaw during a private ceremony in the Orchard in an effort to avoid traumatizing the young and old creatures who loved her.
Piknim's passing inspired Rollo to order the destruction of St. Ninian's, having remembered the names of the previous vermin who had claimed the place before the jackdaws.