3 is the most interesting. #1 doesn't sound like it'll go anywhere. #2 is cute, but I don't care for squib!
Neville, I prefer him as 'struggling to use his magic' Neville. It is big part of his character. What's the point in using a character if you're going to deliberately make them OOC.
Change the story so the character acts like the character or just create an original character. OOC sucks. OOC is short for 'don't bother reading, cause I couldn't be bothered to write the fic properly'.
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.