I see a bit of Prince Edward in Louis
Well William is like Edward. He used, as a child, to be like his mother but as he has grown became more and more Windsor. He is very like Charles and Edward.
The boys are very much Middletons with George resembling his maternal grandfather. Louis is like his mother with a slight resemble to Edward and therefore William. Charlotter is the most like William and I can see the temptation to say she will be like Diana. But William didn't grow up to be like her and I can see Charlotte being more like her mother in the long run.