In that case I'm not sure Jigsaw, Michael Myers (in his original incarnation) or Jack from the Shining qualify.
Norman Bates and Leatherface are the grand-father and father of the modern slasher flick respectively, and TCM also spawned the golden age of grindhouse horror so both deserve to be on this list. Personally I'd drop Reagan McNeil and Carrie (or even Jigsaw, despite my vote) to make room for them.