When you read a fantasy novel part of the fun is getting to explore a new world. Everyone knows that. But I believe the same is true about characters. You can explore interesting people in the same way that you explore a town or a culture.
I forget who it was that recommended men for their soul's good to do each day two things they disliked: it was a wise man, and it is a precept that I have followed scrupulously; for every day I have got up and I have gone to bed.