Favorite book is Wuthering Heights! Love how I felt claustrophobic reading it. And the horror I felt like watching the characters' inevitable ruin.
Or The Golden Compass for the world building and the characters. The whole novel feels magical and there's this nostalgic / melancholy atmosphere throughout the book. I haven't gotten my hands on the sequels but to be honest I'm kind of afraid that it might not be as good as the first one.
Or Edensor... absolutely magical. Gorgeous prose. I was awed by how my own language could be so beautiful after reading it. The ending left a deep impression on my younger self.
Hard to pick one haha.
As for favorite book character... to be honest, no one comes to mind.