Ivy was a mousemaid knifethrower in a traveling circus, and kept all her knives (which she had been given by her father) in a belt around her waist. She had a rather feisty personality and her skill at knifethrowing intrigued Matthias. At first, many of the Redwallers were suspicious of her, but soon, it is discovered that she was an ally, and Ivy helped to fend off the attackingrats when they try to enter Redwall Abbey.
When she left, Ivy gave Cornflower her vividly purple coat, saying it was a circus tradition. Throughout the episode, it was implied or suggested that Ivy is also psychic. Wild Ivy makes some predictions for Matthias. Before she walks out of the gate, she tells him she was wrong to try and predict his future.