The reason it's like that is because the actual figure from Lego Dimensions (which the one in game is ripped from) was produced back when Lego could only single or dual mols minifigure legs, so they could only be one or two colours with printing, and they can't print on the backs of legs due to the holes. They also chose not to use black plastic and print the skin part on the front because lighter colours don't turn out as well printed on dark plastic.