Aslan I wouldn't have chosen him as a favorite when I was younger but lately I have realized how much his character means to me, he is either in my favorite scenes in the books or, if not present himself, he is being discussed by the characters who are. 

Lucy Another character who has worked her way into my heart. As a young girl I thought she was boring compared to Jill or Aravis but as an adult Lucy is the character I most want to emulate. Her faith in Aslan and the love she proffers to everyone she meets are truly inspiring.

Edmund He went from being a treacherous, spiteful, lying boy to King Edmund the Just. His love for and trust in Aslan was second only to Lucy's and I have always appreciated how he never forgot the sacrifice Aslan made for him.

Peter The older brother I wished I had as a child and the sort of leader I most admire. I've always wished he had been in more of the books.

Jill Feisty, flawed, feminine. The girl character I related to the most when young (except for her head for heights, I'm with Eustace on that!)

Puddleglum His unrelenting pessimism makes me smile but his display of moral and physical courage against the Emerald Witch will always be one of my favorite scenes in the series.

Reepicheep I love his quickness to forgive Eustace, the courage he shows on every occasion, and the loyalty he inspires in others. Perhaps my 4 year old nephew sums it up best: 'Reepicheep is a great friend.' And one I would love to have.

Trumpkin Despite not believing in Aslan or the ancient kings and queens he volunteered for a dangerous journey that had the end goal of meeting the one or the others and in the end met them all. Also, he makes me laugh.

Hwin Her gentle nature has long ensured her a place as one of my favorite Narnians.

Jewel His unwavering belief in Aslan, despite never having seen him, the kindness he showed Puzzle, and his loyalty to Tirian. Who doesn't love a courteous unicorn?

Aslan - how could I not?

Puddleglum - I am a recovering pessimist, and I'm practical to a fault, so I can relate. He also provides some welcome comic relief to one of the darker books in the series.

Lucy - her childlike faith is something that we can all learn from, no matter how old we are.

Ramandu - C.S. Lewis's description of what a star is (as opposed to what a star is made up) is fascinating. I like the air of mystery that remains despite him being so straightforward in explaining his story.

Coriakin - Along similar lines, there's such an air of mystery here. The big question - what did he do? (I don't think it's quite akin to the Christian concept of fallen angels, since him and Aslan still seem to be on good terms.) And how did he know Lucy was coming to undo what he would do?

Polly - She's the more mature of the two kids. Despite her being a little cautious, she's still fearless (she ran out to the fight at the lamppost despite the risk of being permanently banned from seeing Digory, and asked to go with Fledge and Digory). And I think it's cool how easily she ended up forgiving Digory.

Doctor Cornelius - He risks his life to help Caspian, and his goals are modest - he wants good treatment for dwarves/half-dwarves. He doesn't ask for political power, but he gets it in the end - shame we don't find out what happens to him after.

Edmund - He turns into being probably the wisest kid of all of them. I really like his maturity in talking to Eustace on the beach after he becomes de-dragonized, and his gentleness with Shasta after he stopped eavesdropping.

Lune - A gentle and humble ruler, and merciful, even to Rabadash. If only all leaders were like him.

Digory - Just as fascinating as an adult, but despite his mistakes, he proves to be very mature for his age in the Magician's Nephew.

Honorable mentions include Corin, Frank, Trumpkin, and the Hermit at the Marsh.

1) Peter: He has always been the best character no doubt . He always cared about all his siblings . He was true leader of Narnia . He was Aslan's choice. Long live High king Peter 

2)Aslan: I guess everyone loves this character

3)Beaver

4) Lucy

5)Tumnus

6) Kirke

7) Caspian 

8)Puddleglum

9)Jill

10)Reepicheep

I know this post is long dormant, and I am kind of late to the party, but I love this question!

1) Aslan. There is something about his deep self, his love for his own, his bowed head and humiliation and yet willing death at the stone table, his wild breath which heals death and sends children between worlds, his unflinching watching of Jill by the stream, his youth at the very end. He's the best magical creature there has ever been.

2) Puddleglum - Pretty big jump from golden Aslan to dark, dank Puddleglum, but it's hard to get better than a Marshwiggle who always has something positive to say - turned negative. And his bravery in the Green Serpent fire scene is unparalleled (besides the stone table). I've thought on that scene so many times.

3) Lucy - She is steadfast, just plain good, and curious. We're talking about the books. There is something in her dear comment that Mr. Tumnus is the nicest faun she's met - Lewis shows us clearly something of her heart.

4) Tumnus - For as long as I can remember I've loved the lamp post scene (probably obvious), and I remember trying to dress up like him with no better resources than khaki pants and brown socks. It was a super fun suprise the first time I read THHB.

5) Eustace - Absolutely hilarious in VDT. I crack up every time I read his diary entries, and I think he probably got the best intro. Very memorable. His character transition is also the most dramatic. Furthermore, he is the only human who becomes an animal for a short time.

6) Trufflehunter - level-headed, sturdy, loyal, a badger, need I say more?

7) Shasta - sort of a dull character, but there is something going behind the scenes with Shasta which I find alluring. Lewis reveals a whole new side to Narnia through Shasta. There is something humble about his character (his pride is the sort of pride only someone of so low an upbringing can have, and he seems to me very real in that way). 

8) Reepicheep - Another hilarious character. His dialogue with Eustace is super, but it doesn't get better than his dear love and desire for Aslan's country. He adds so much to VDT.

9) Poggin - remember the bashful dwarf who breaks away from everything he knows to follow the faithful Narnians and Aslan?

10) King Frank - honest, open, good-hearted, Aslan's choice. I love his humble response to Aslan's questioning. Lewis was right - people like him should be king.