The faun who first meets Lucy in Narnia is Tumnus, usually called Mr. Tumnus.
Lucy encounters Mr. Tumnus after entering Narnia through the wardrobe in The Lion, the Witch and the Wardrobe. She finds him near a lamp-post in a snowy wood, carrying parcels and an umbrella. He invites her to his cave for tea and introduces her to the strange, wintry world she has entered.
Tumnus initially works for the White Witch, Jadis, who has ordered Narnians to hand over any human visitors. However, he cannot betray Lucy. He guides her safely back to the lamp-post, choosing compassion over obedience and risking the Witch’s punishment.
Later, Tumnus is arrested and turned to stone, but Aslan restores him. The character was inspired by an image C. S. Lewis imagined of a faun carrying an umbrella through a snowy forest. Tumnus is Lucy’s first Narnian friend, not Duffle, Grumpy, or Trumpkin.