In a sort of way you can say that Cesare is the father of the slashers, followed by Hans Beckert, then Norman Bates, and finally Michael Myers would be the one who served as an starting point for Jason Vorhees.
hmmm... not exactly. his mother went nuts after losing him. and while raising him in social isolation to prevent the other to hurt him, she missed all the social skills part of education. he's wonderfully pure asocial, as a psychologist i really admire that unusual case
and his 'mother' talking to him is a hallucinatory psychosis on a base of his unability to figure out the death conception