Thinking about the Straw Hats there is only one who dosen’t have any Devil Fruit power or uses a weapon and that’s Sanji.
If one of the Straw Hat’s get the mera mera fruit I can see it being Sanji or possibly Usopp.
Though I don’t think Usopp would want it. Because his dream…
Yeah this wasn’t a serious thing. Just my opinion on who I thought was better suited for the mera mera fruit out of the Straw Hats. :3