After reading the Enies Lobby arc I was struck by what Aokiji said to Robin afterwards:
If you take it literally that would be an example of the "Will of D", a character essential to the One Piece plot is only alive because a D willed it. So do they have an all powerful will over other 'regular' people? Here's what I've been able to think up so far;It is my duty to observe what you do with your life because I respected [Jaguar D. Saul's] will.
Monkey D. Luffy: His will is obvious in many ways, from recruiting reluctant crew members to inspiring numerous people to follow through their dreams and their fights.
Gol D. Roger: Willed the pirate age.
Marshall D. Teach "Blackbeard" : He willed himself to become powerful and a Shichibukai, not an easy task.
Jaguar D. Saul: Willed Robin to live and to smile, so far so true.
Monkey D. Dragon: As near as I can tell he's willed a revolution, but no one knows much of him.
I'm not entirely sure what Ace and Garp's will might be considered as, in fact those two seem to have their will directly defied albeit from another D:
Monkey D. Garp: Willed Luffy to become a strong marine, didn't quite happen.
Portgas D. Ace: Had the will to take down Blackbeard, he appears to have lost.
This is just a thought that crossed my head, but what do you think?