The central characters were all immensely likable and full of personality. Even Olaf (a goofy sidekick character who actually made me laugh... and loudly).
Yes, I'm surprised by how much I liked Olaf. When I first saw him, and heard that headache-inducing voice, I was sure I would hate the character. But I didn't. Not only did I find him hilarious, but I really cared for him as a character and sympathized with his plight.
Well done filmmakers. Well done.