Emperor Hirohito generally was not portrayed in posters. He was considered a deity, and his divine presence could not be sullied by crude caricatures so the Japanese glorified a secondary leader, General Tojo
The best that the Japanese could do with Hirohito was to include a photo of the Emperor alongside those of the leaders of Japan's allies. This did reflect a common theme of wartime posters, that of unity with the nation's allies.
Japanese dominance in modern technology. The Imperial Air Force and Navy were particular figures of pride.
There is heavy emphasis on the military as being full of modern, sophisticated soldiers. The subtext is, "Look how smart and capable we are."
Japan often is portrayed as dominating the air, and thus, the world.
The Imperial Navy is often portrayed, out at sea guarding the home islands, as staffed by dedicated men.
Another main theme of Japanese propaganda posters was national pride. The posters artistically portrayed the Japanese as heroic warriors. Thus, references to Samurai is common.
A Kamikaze pilot off on a mission - his last one, of course. He is saluting and ready to do his duty. The traditional symbols of Japanese honor, such as a ceremonial sword, are included as if to say: it is your heritage to do your duty even if it is a one-way ride.
Doing your duty included simply doing your own job, whatever it was. Happiness through ordinary work was a common theme. This would supply the government, portrayed in the distance in the above poster.
Rakes and shovels are portrayed as just as important to victory as machine guns and rifles.