User blog comment:Yaminogaijin/Weekly Blog 3: Who will you think will be the 10th Straw hat and why?/@comment-4080028-20130423014013

I can't say for certain myself, though i'm with half of you on Jinbe joining up with the crew later. The only other people I can think of for now is Vivi and Carue, due to the amount of time they spent with the crew; albeit I expect them to join up much later than Jinbe, or possibly even after One Piece has come to an end. Since I can see the Straw Hats wanting to head back to Alabasta to reunite with them.

As i'm only up to the beginning parts of the Punk Hazard Arc right now, those are the only ones who come to mind for me at the moment.