Hitler was responsible for WWII
WWII is responsible for the New World Order and a permenant change in the world
so......if you put those together, Hitler was very influential, although perhaps a little indirectly
If you put it this way then Hitlers gramps are the most influantial figures , as they were responsible for Hitler , who was responsible for ww2 and so on.
What about Jesus then. He had no direct ancestors , leave out God himself.And after all , Hitler's tale lasted a decade or so. wheras Jesus has been rocking the world for a long time , and Bible is the number 1 bestseller of all times.The second is "the Principia" by Isaak Newton.