on Writing Forward:
Most authors agree that fiction is primarily driven by characters. Experienced authors will talk about characters who take over the story, who have their own separate and independent consciousnesses. Outlines and plans for plot go out the window as characters insist on moving the story in a direction of their own design.
Because characters are central to most stories and because their primary function is to explore the human condition, it’s essential for characters to be believable. In other words, characters may not be real, but they most certainly should feel real.
It’s not easy to write believable and realistic characters. People (and therefore characters) are highly complex and layered, full of contradictions and flaws. Because writing imposes space-time limitations, we can never craft a character that is as complicated as a real person, but we can certainly try.