This is Seppl, Kasperl’s best friend and trusted companion. In the traditional German Kasperltheater he usually looks like the stereotypical Oktoberfest German, what with his Lederhosen and pointy green hat. Being reduced to a cube, there is not much left of the pointy hat, but I am somewhat partial to the slightly bizarre cap into which the hat turned:
The name Seppl, by the way, is a short form of ‘Josef’ – just like Joe is in English.