Reepicheep the Mouse is a fictional character in the children's fantasy series The Chronicles of Narnia by C. S. Lewis. He appears as a minor character in Prince Caspian and as a major character in The Voyage of the Dawn Treader, and also briefly at the end of The Last Battle. Reepicheep is a Talking Mouse, the leader of the Talking Mice of Narnia; he is irascible yet imperturbably courteous, utterly without fear, and motivated by a deep concern for honour.