Não é filler, pq é um spin-off do mangá. Fairy tail zero é fairy tail na mesma, só q vai contar apenas a fundação da guilda, mas depois vai continuar Fairy tail normal com as sagas seguintes (saga avatar, alvarez).
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.