One of the things I actually like the most about One Piece is the fact that the villain's backgrounds are pretty much irrelevant and rarely shown. We got a flashback of Buggy's past (which I believe is because Buggy will play more big parts of the OP story), we know that Mr. 1 Daz Bones was once an assassin, and we know about Arlong having been part of Jinbei's crew once. But that's it. We know nothing about the characters, and that keeps them mysterious, and yet NOT at the same time.
I find that fantastic. Another fantastic thing about it is the point of this thread… everyone can make up their own background for these villains.
Which I think we should do in this thread.
If you have a theory/a good story about one or more OP villains, I figure you could be able to post them here. Not for facts and the like,but mostly for kicks. Of course, you'd have to get the points stated in the series in your backstory too (Arlong being in Jinbei's crew, Don Krieg raiding a Marine ship, etc)...
Get it going, people. ^^