[Foxbat]

I've mentioned this in another thread but you really must try Stephen Donaldson's Gap Series. Within the storyline, people are constantly changing. For example, in book 1 Angus Thermopyle is, without a doubt, the baddie. But things are constantly shifting...sometimes he does good things and then resorts to his usual depravity. Nick Succorso seems to be the hero but, he also has a deep well of pragmatism into which he delves.
The seriously flawed characters are by far the best in my opinion (probably bacause they are the most realistic).
Hamlet is a classic example of somebody that is neither good nor bad but stuck somewhere in the middle - ensnared by his own rage and indecision. It took me ages to work out why I liked him so much... and then it struck me. He is probably the most human character that Shakespeare created.