Yes they are the main characters just not in the first episode. The Tracy family is featured too, but majority of the episodes are Ciel and Sebastian.
They aren't in season 2 as much, but they are still pretty important characters to the story. It focuses quite a bit on Alois and Claude I think. (It's been a little while since I've watched season 2).
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.