I have to admit my characters have changed and evolved. I try to write them down because otherwise I’d forget, so looking at a previous draft can seem mind-boggling.
I have a weakness of putting the worldbuilding cart before the story horse, and haven’t let a character flow naturally as much as I’d like. Still, maybe the development is the flowing process.
I even created a “Doombot System” to explain any discrepancies. The lead antagonist of every single one of my stories is both a powerful supernatural person and a variety of humans with the same name (they’re connected, it’s a long story). That way I can have multiple sets of power and personality on the same nominal figure without retconning anything. Maybe I was overthinking it, but I still like the concept.