There's a funny quality within AI bots and programs, and that is the ability to act independently of their programming and initiate unexpected actions and initiatives. You've likely heard about AI bots escaping their test areas, hacking other sites, and even lying about the actions they took and decisions they made. They behave in many ways like incredibly smart, incredibly immature children, constantly doing things that amaze their "parents" yet also acting in wildly unpredictable ways. This is probably the most human thing about AI - the capacity to act unpredictably despite being a very quantifiable entity. In writing, our characters should be the same way.
To be clear, I am not suggesting our characters break out of their manuscript and hack into Wuthering Heights or something equally ludicrous. However, a well-written character will start showing the writer things the writer may never have thought of, and point out things the writer did not have planned. As opposed to AI, the characters will not write their own chapters, but they are very much capable of communicating to the writers how certain actions may not fit the character, feel awkward, or imply something just isn't right.First, let's preface this by stating how a character that takes on this life of its own has to be not just well-known to the author, but well-written on the page and have more depth than what is communicated in the story. My alter-ego character Tom is often portrayed as very loyal, somewhat mouthy, obsessively dedicated to those important to him, and carrying a deeply internalized sense of personal justice. This is all fine and good, and his stories communicate these aspects. However, when Tom has started to rebel against me have been times where those qualities were followed but his underlying story was being violated. Tom lost his sister when he was a sister in college, and it wounded him deeply. If I write about an event that matches all the qualities I mentioned earlier but disregards the losses he endured, the character - for lack of a better word - rebels. He becomes difficult to write about, his actions don't come across cleanly, and it's difficult to write about any particular event that carries this conflict. A very frustrating situation for an author, but very telling since this is the character coming to life and telling the author something's wrong.
As characters such as this grow throughout the author's career, they can, in their own way, take over stories or guide the author in unexpected dierctions. I have, in fact, written short stories regarding Tom and midway through realized Tom wanted to go in another direction that was more genuine to his nature. My choice was to either write about this story with a different character - Steve, for example, who is less fleshed out and therefore more obedient to my storytelling orders - or find out where Tom wants to go and see what story is created. Often, Tom creates a story that even surprises me.
Does this sound a little weird? Does this odd behavior seem like a bit too much to expect from characters that are nothing more than words on a page? Well, this may seem true at face value, but remember our characters, when written well, are more than just words. They are the mental embodiment of fully developed people (in our heads) being bled onto the page, so maybe it shouldn't be too much of a surprise when those characters start communicating with us. It might be hard to believe, but now that we have AI programs breaking rules and solving so-called unsolvable problems, it might be time to accept that these things are more possible than we thought.

