Narnian Talking Beasts, Dryads, Dwarfs, Fauns, Marshwiggles, Centaurs, etc.
(Disclaimer:  This text is taken from Paul F. Ford's Companion to Narnia.  I am not stealing, just borrowing.)

Aslan:  The Lion King of the land of Narnia and of all its creatures, the son of the Emperor-beyond-the-Sea, true beast and the king of beasts, the highest king over all high kings, and the as-yet-unrecognized good and compassionate Lord of all, beginning with the children from England.  The very hearing of his name is an experience of the numinous for all who are destined to live in his country, but for those who are for a time or forever under the spell of evil magic his name is filled only with horror.  The beholding of his beautiful face sustains all one's days; and the recognition of that face with love and awe at the end of time opens out onto an eternity of joy.  To be addressed by him as "dear heart" or "little one" or by name is a lasting, cherished blessing; to be rebuked by him is an everlasting shame.  Whom he praises with an earthshaking "Well done" remains forever favored; whom he blames or punishes is humbled in the hope of an enduring change of heart.  Though he is wild--that is, all-powerful and free--he delights to be at the center of the dance of those whom he has made; he welcomes the help of others, both beast and human, to accomplish his plans; and he is the very often unnoticed storyteller behind every person's story, guarding the privacy of each, keeping faith with all.  Lucy and Caspian and Reepicheep seem the English woman and the Narnian man and the Narnian Talking Beast most beloved of Aslan in all the Chronicles only because more of their stories is told.  But the apex of Lewis' literary, mythopoeic, and apologetic gifts is the character of Aslan, because this Lion comes straight from the heart of Lewis' contemplation and enjoyments of God and of the world God made.

Fledge:  The winged horse who carries Digory and Polly to the garden in the west; orginially a cab-horse named Strawberry.  As Strawberry he is tired, and when first encountered heis being flogged and maddened by Jadis.  But his father was a cavalry horse, and in Narnia his noble heritage is apparent.  In the Wood between the Worlds he already looks and feels better, and it is his desire for a drink that leads the entire London group to Narnia.  At Aslan's creation song, he looks and feels stronger, younger and renewed.  Strawberry speaks for all the Talking Beasts when he declares, "We don't know very much yet" in his "nosey...snortey" voice.  In fact, he has already forgotten most of his former life, most of it bad--the work, the hard streets, the cart.  The best thing he remembers are sugar cubes that riders used to give him.  At Aslan's command, he becomes a winged horse named Fledge, the fater of all flying horses.  His wings sprout chestnut and coppery from his back.  Though transformed, he is still Strawberry somewhere inside, for he is puzzled at first that the children cannot eat grass, and--perhaps because of some primal memory of his past life--he shivers at the passing of Jadis.  He is reunited with Digory and Polly at the Great Reunion in Aslan's country.

Tumnus:  A flute-playing faun who is approaching middle age and becoming stout, he has the characteristics of his race: the legs of a goat, the upper body of a man, curly hair, and two little horns on his head.  He is about the same height as Shasta, probably about four feet tall (the same height as a good sized dwarf).  The origin of his name is not clear, although it is a Latin diminutive of some sort.  It may be from tumulus, meaning "hill," as Tumnus lives in hilly country.  He is the first Narnian that Lucy--and the reader--meets in The Lion, The Witch, and The Wardrobe, and she politely calls him Mr. Tumnus.  He invites her home for tea, thinking to turn her over to the White Witch as a Daughter of Eve; but he is too kind to do so, and is eventually arrested for treason and turned into a statue in the courtyard of the Castle of the White Witch.  Revived by Aslan, he and Lucy dance together for joy.  He is the first-named friend to be rewarded and honored at the coronation of the Kings and Queens, and many years later returns to tell them of the sighting of the White Stag.  In Horse and His Boy he is a loyal Narnian who hates every stone of Tashbaan.  It is his idea to stock the Splendour Hyaline, to fool Rabadash, and escape.  He enters into Aslan's country at the judgment, and discloses to Lucy the mystery of the glory of the within-ness of the garden and Narnia:  "The farther up and farther in you go, the bigger everything gets."

Mr. and Mrs. Beaver:  [Mr. Beaver is] A cordial, hardworking creature, proud of his dam-building skills and lovingly content with his domestic situation.  He seems to be a prototype of the sturdy, working-class Englishman.  He befriends the four children in the Narnian wood, proving to Lucy that he is trustworthy by showing her the handkerchief she had left with Tumnus.  He invites the children to dinner at his cozy home.  here he becomes the expository vehicle by which Lewis introduces them and his readers to some Narnian history and characters.
A kind old she-beaver devoted to her husband, Mr. Beaver, [Mrs. Beaver] is happily busy at her sewing machine most of the time.  She keeps a snug home, which is decorated in a sea motif.  When the children arrive, she greets them with a Simeon-like "To think that I should ever live to see this day."  In speaking of Aslan, she says that anyone who does not fear him is either very brave or very foolish.  She is both intuitive and practical: intuitive in sensing that the Witch will try to use Edmund as bait to catch the other children; practical in taking pains to determine just how much Edmund knows to tell the Witch and how long it will take her to catch them.

Giant Rumblebuffin:  A good giant, freed by the breath of Aslan from imprisonment as a statue in the White Witch's courtyard.  Aslan enlists him to break down the gate and towers of the Witch's castle.  Winded and sweaty from this effort, Rumblebuffing asks for a handkerchief to wipe his brow.  When Lucy ofers hers, he picks her up bodily, thinking she is the handkerchief.  In true giant fashion, he clubs and tramples in battle, but always on the side of good.  He is rewarded and honored at the feast of the crowning.