Weaver
Sage
There was one incident when I was only thinking about a story I was working on, and out of nowhere, the protagonist said to me, "I am not a g!@#m metaphor!" I don't know if that counts as an argument; I had not intended to use that character as a metaphor anyway, although apparently he was worried that I might.
But yes, I have had characters go in directions other than those I'd planned. I had one character, originally meant only to be VERY minor, who ended up as a major secondary character in a novel. (It wasn't HIS intention, either, but one of his friends had other plans, which he declined to share with the authors until it was too late.) I've had a characters who was first written as a bit angsty and a loner end up happy and outgoing, the sort of person who is better able to deal with life's tragedies. (I'm pleased for him, but I wish he'd let me know sooner -- it would have made writing the story in which he's major supporting cast a lot easier.)
But yes, I have had characters go in directions other than those I'd planned. I had one character, originally meant only to be VERY minor, who ended up as a major secondary character in a novel. (It wasn't HIS intention, either, but one of his friends had other plans, which he declined to share with the authors until it was too late.) I've had a characters who was first written as a bit angsty and a loner end up happy and outgoing, the sort of person who is better able to deal with life's tragedies. (I'm pleased for him, but I wish he'd let me know sooner -- it would have made writing the story in which he's major supporting cast a lot easier.)