Yes, of course I have more on characters. (Because what writer doesn't need better characters?)
Miriam Forster did a 6-part series on character building, but my favorite is the Edward/Bella dilemma. How much better would the Twilight series be if it were told from the POV of a character that struggles with larger-than-life problems?
Arguably one of the best posts by The Great Nathan Bransford: What Do Your Characters Want?