Since all the needed points and rules that you need to follow are already given, I can only give you some tips, to be more exact what couple of protagonist and antagonist you can describe in your essay. I think it would be nice and quite interesting to take a conflict between Harry and Draco from ''Harry Potter book series'' as a basis. Even though at first sight Draco might seem as a foolish, stubborn and arrogant person who always resist Harry, he also has some good traits and circumstances which made him as he is. There are too many points to discuss between these personalities.