Don't for everybody's same cos playing isnt fun unless your at some con and your waaaaaaaay to young.
That is an incredibly hard question. I'm pretty sure your mom is going to say no. #1 Your 11.
#2 Cosplay is mostly for anime. #3 Arguing with your mom is not the brightest idea and there is no way to change her mind. I'm sorry but this is just how parents are .
Once they decide something is innapropriate or weird they don't ever want to hear about it. Try and figure out a loophole or something. Personally, I don't think you shouldn't cosplay those characters.
First ask your mom to take you to a store so you can dress up like an Eskimo hooker. Then ask for money to cosplay.
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.