Mr. Tumnus is a faun in The Chronicles of Narnia, a fantasy series by C.S. Lewis. Fauns are mythical creatures that are part human and part goat, typically depicted with the upper body of a human and the lower body of a goat, complete with hooves and horns.
In the story, Mr. Tumnus is characterized as a kind and gentle creature who befriends the protagonist, Lucy Pevensie, when she first enters Narnia. He lives in a cozy cave and enjoys playing the flute and enjoying nature. His character embodies the theme of friendship and the struggle between good and evil, pivotal elements within the Narnian narrative.