In the vein of character development… i’ve always loved Vonnegut’s suggestion that every character should want something..even if it’s only a glass of water. It ties into the human need to need. Everyone wants something. Once you know what your character wants, you know how they should behave, their purpose, and what drives them toward the end of your story. The want for nothing is a spiritual endeavor but for a good flawed character..make them greedy with wants.