I would want them to be the same sex and identical. That is just my opinion.
I've got twins, they aren't identical but look extremely similar. At first, I wanted identical twins myself because it's so cute seeing little identical twins, but then on reflection I changed my mind 1) because I learned that during the pregnancy it was safer if each twin had their own placenta, and 2) because I decided that it would be easier for them to grow up as individuals if they were not the mirror image of each other. I don't know if I´m right because they are only 1 now but it is a true joy whether they are identical or not I think.
If I would be twin, I would prefer being identical, because you can have a lot of fun in your childhood, and you can do so many things if another person looks the same as you, for example if you are asked in school, and you are not good in maths, your brother can go on for you, or later at jobs, and things like that, it can be fun.
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.