What's the character in the poster hanging on the wall supposed to be?


In the beginning of **Urusei Yatsura - Beautiful Dreamer** , the class is
setting up their classroom to be the _"Third Reich Decadent Coffee Shop"_ ,
and in a panning shot of the classroom, there's a poster of a red guy that is
obviously supposed to be dressed up as Adolf Hitler. But what's the character
supposed to be? Is it a reference to some bit of popular culture or from
another show?

![enter image description here](https://i.stack.imgur.com/pnPqv.png)

