When characters takes over

There are occasions when characters take control of their part in the story. Mitchell Ebberhaus in "The Negative's Tale" did this. Characters with a life of their own are much more believable and real, so I let him be who he wanted to be. Originally, he was going to be a minor character appearing a few times in a supporting role. He would not stand for that. Mitchell insisted on subsuming the part of another character, a major player. Once Ebberhaus asserted himself, that other character simply ceased to exist. He was completely absorbed by another persona that would not be relegated to the background.