Writer's Fallout Shelter

So true; we can't help but insert ourselves - in the form of our thoughts and opinions and perspectives on the world - into EVERY character we write. Some may be the "anti-author" but wouldn't be, if the author wasn't who he or she was.

As for your genre question, I don't know - but hating each other on first site, and later becoming lovers (or at least very good friends) isn't all that uncommon in real life, so I cannot imagine Austen invented it. She may have been the first to use it in a novel; it would make for an interesting research project.