User blog comment:The ASL Pirates/The Straw Hat's Devil Fruit Hunt/@comment-24850639-20150601131312

Not counting people who've eaten fruits already, that leaves Zoro, Sanji, Nami, Franky, & Usopp.

Sanji - takes pride in being the best swimmer of the crew, blue walk, etc.

Zoro - Not likely, Luffy also took pride in his ability to fight in the water

Franky - flat out said no to losing his ability to swim when Luffy offered the Mera

So in my opinion, the only people I could seriously consider for this would be Nami or Usopp. They're the 2 weakest of the crew and ALWAYS have been, so I could certainly say they might be due for some kind of upgrade. But then again, we haven't necessarily seen the extent of their new abilities quite yet, and Usopp just awakened Kenbunshoku. If either them did entertain the possibility of a DF, to me it would HAVE to be something that they know will naturally augment their abilities. So its personally hard for me to imagine them finding a fruit where they don't know what it is, and deciding to have someone eat it. I doubt anyone in the crew is a walking encyclopedia on Devil Fruits, so if they do stumble upon one like you suggested they'd prob hold on to it til they learned more. As for what those abilities might look like, really the world is too vast to guess. I personally think it would be awesome if Nami found some paramecia type of fruit that enhanced her control of the weather somehow (doesn't HAVE to be logia), or if Usopp found something that might help his range or vision, kinda like Violas.