I don't know about most authors, but I'd have to say if you questioned each one of your favorites, they'd tell you one of their quirks. Or maybe they wouldn't call them quirks.
All I can say for sure is I have a few that I consider "quirks." Most of them are in regard to those things I like or love. Here is one of mine. Those of you who've seen my titles will notice I've used ellipses in three of them. Now you will hear other authors and some editors repeat that ellipses are evil and not to use them - not exactly in those words - but definitely don't use them. Probably have heard that about italics too. And other incessant suggestions or rules that were made to be broken because they're based on personal opinions.
So, having now seen my three titles using ellipses, here is the extra quirkiness to those titles. Seeing . . . was the first one written (with ellipses), . . . in a love song was the second, and Then . . . you was the third and final one with ellipses. Notice how each one is differently placed? Yeah. Crazy, huh? I think it's cool.
I dare the other authors I know to name one of their quirks. Smiling . . .
Father, thank you for the fun of writing, of telling stories, of finding words. I ask your blessing upon your authors and that you would continue to give them the stories you have just for them to tell. Thank you is never enough. In the Name of Jesus, Amen.