I do love it when things come together, and in unexpected ways. I blogged a while ago about finding an elusive character (my creation) in an earlier story, Here She Is. I've just discovered someone I thought was a bit-player, quietly in the background, is one of the major characters in my novel. How this character will feel about being dragged from obscurity into the limelight, I don't know. Perhaps he/she liked being a bit-player. Or perhaps he/she will see this as the big break every actor craves. In either case, it's a turning point for the plot and one that liberates other characters to behave as they please, rather than trying to fit my machinations.
To be clear: I had no idea this character would be The One. I did not write him/her to fit that mould, or not consciously. But now I come to look at him/her I find that all the facets are there, everything I need in terms of motive and opportunity. The smallest tweak and it falls into place. At least I hope so. I'd better get writing and find out.