Sister Nasturtium was a plump, jolly mouse kitchen assistant of Redwall Abbey. She was very pretty and a favorite among the children at Redwall. She had a beautiful singing voice that Samkim admired. She was somewhat of an oracle since the Spirit of Martin the Warrior used her voice to convey a message from time to time. She was afflicted with the worst case of Dryditch Fever among the Abbeydwellers; however she later recovered.