It was suggested that giant robots were the way to go.
Foolishly I said:
Again, for the Japanese I will go for a contemporary approach - sadly giant robots weren't part of popular Japanese culture on the 1940s. Neither were cute schoolgirls with big guns :)So, no giant robots:
And no cute schoolgirls with guns:
OK, so the first one isn't a robot, but it could oh so easily be one. And the individuals in the second poster are schoolboys rather than schoolgirls. But it just goes to show that you shouldn't rule out anything when it comes to propaganda posters, which are an excellent source of material for any fantasy WWII army.
Of course, whilst searching for those posters I found this pro-Polish one:
You want to do an element like that don't you? Admit it.