Following on from the Time Traveller's Wife thread, and the Autumn(book)watch one, what makes you care about the characters in whatever book you're reading?
For example, I'm reading 'Cold Mountain', and the characters, I don't know, the writer just has a way of making you care about them.
Although I'm not really sure how he does that.
Other times, though, I just find some characters totally unsympathetic and consequently hate the book or don't finish it.
What does it for you?