My problem as a writer is that—whenever I meet someone for the first time—I immediately invent for them a personality and background that are invariably more interesting than the ones they possess. And confirming this character to be uninteresting after a few minutes of conversation, I decide that they are unnecessary to my story and begin devising ways to kill them off.
In daily life we never understand each other, neither complete clairvoyance nor complete confessional exists. We know each other approximately, by external signs, and these serve well enough as a basis for society and even for intimacy. But people in a novel can be understood completely by the reader, if the novelist wishes; their inner as well as their outer life can be exposed. And this is why they often seem more definite than characters in history, or even our own friends; we have been told all about them that can be told; even if they are imperfect or unreal they do not contain any secrets, whereas our friends do and must, mutual secrecy being one of the conditions of life upon this globe.
(Every great character, Iz, be it on page or screen, is multidimensional. The good guys aren't all good, and the bad guys aren't all bad, and any character wholly one or the other shouldn't exist at all. Remember this when I describe the antics that follow, for though I am not a villain, I am not immune to villainy.)