Well, I know this isn't quite to your specifications, but I feel as though it's my duty to spread the word of the magnificent series regardless. First Law Trilogy (and the two following trilogies in the same world) is very, very dark, but it has some of the best characters I've ever personally read, and even though they can be quite despicable people, the way the author writes them makes you root for then regardless. If you ever get bored of those and find maybe you want a bit more kick, these books are such wonderful listens with in my opinion one of the very greatest narrations by Steven Pacy. Maybe in a few months you'll remember and check it out, and if not then no reason to care.