I like most of the characters.
Professer Kirke - He never made it back to Narnia till the end, but he never, ever stopped believing. He knew what was true in his heart.
Peter - He was already nearly a man when he entered Narnia the first time. Imagine the shock and the tendency to wonder if it was a dream. Many teenagers think they already know everything that's true and right - I was one of them. But Peter embraced where he was and what he became, and even in the face of incredible danger and fear, he always did what was right...and what's right isn't always easy.
Susan - She refused to believe until she was there, and even afterwards, her too-logical mind convinced her it was just a dream, just a game. But all the same, she fought for what she believed in when she was a believer - and that has to count for something.
Edmund - He was struggling, with his place in his family and his place in his world, then suddenly stumbled into this incredible new world. He met someone evil, and said things he shouldn't have - but how was he to know? Lucy, at that point, hadn't said anything about evil witches and over a century of hate. But he realized his mistakes, and repented. And he was forgiven. That forgiveness changed his entire life; it shaped the rest of his decisions.
Lucy - Is there ever anything so magical as the faith of a child? Her willingness to believe with all her heart and to trust her instincts no matter what made her one of the most faithful followers. She was strong, unwavering, loyal and true - and kept those same qualities because she had a family who supported her and believed in her.
And, of course, Aslan - a symbol of good, of light and knowledge and beauty, of truth and justice, courage, compassion, hope and faith. And of love - unconditional love. If I were a Narnian, I'd follow him anywhere. And I follow Him here, too, where He's known by another name.