[Spoilers on Ds]
I do not own One Piece!
Ehm, for once I'm going to do a request here... Even if the theory by no means is original in my eyes. This is a theory about;
Subject: The letter D.
Source/Inspiration: One Piece and One Piece wikia.
Theory: Well... As I said, this is by no means original! But I'll say what I think of the letter D, which some mysterious persons in the OP universe carries. If I were to say what I think it stands for, I'd say 'Dreamer'. All of the carries are/were people who surely will seize their dreams, if not die in their pursuit of them.
I also think that they carry the fate of changing the world, even if they're not aware of it. Take Luffy for example, he has no intention whatsoever on turning the world upside down, but he does with his actions. His father on the other hand, Dragon, surely knows what he's doing when he revolutionaries against the World Government.
Saul didn't know what he did either when he rescued little Robin, a girl who would grow up with the ability to read the Lio Poneglyphs and end up on the future Pirate King's ship. And she's the cause of Luffy crashing Enies Lobby. Garp fights on the Marines side, kicking the sorry ass of pirates in the name of his justice.
So yeah, these theories are by no means original, but they are what I believe. Complains? I don't care XD
Review if you feel like it!
P.S. I think Krieg compensates for something! D.S.