Alright, this is a very tricky question and I had to think about it for a few days, but I think my absolute favourite is enemies to lovers. It probably was before I even knew the term, after all 'Beauty and the Beast' is still one of my favourite Disney classics. I just love the tension and bickering between the characters. I love how their feelings for each other slowly change - even if they often don't want to admit it at first - and how they have to realize (against their will) that they were wrong about the other person after all. And I think it's great that it shows that hate is not the opposite of love, but that you can only hate people who, for whatever reason, you care about.