Characters - Hate them/Love them

We all have characters that we hate. Completely, totally, despise with all our passion.

But is there any character that you completely hate, but then love at the same time? I think everyone can think of one. That antagonist in a book or movie that plays a major role in the MC's life. They come back, over and over, maybe they are the 2nd MC, or maybe just a side character with a major role.

In any case, it's characters like these that keep the story going. Sure, you may love the MC and any other...