I'm a little confused. You want the cartoon girl to be a hero/ine, with lots of power, but not violent. What kind of power did you want, mind reading, invisibility?
Most super heros have the 'power' to beat someone up. Perhaps instead of a 'hero'/ine situation perhaps look into the real girl detective shows. There were a few of them a couple of years ago.
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.