she will be the weakest strawhat and will be 20 times weaker and the position of a diplomat isn’t important and can be filled by characters like jinbe and sanji and the role won’t be used more than once luffy is the captain you think he will accept settling a deal? and avoid a fight the only time this happened is wci where he allied himself with capone and that was done by jinbei and luffy probably did become his crew was on the line i doubt he negotiate with a yonko to avoid a battle he wants take all of them down
i respect the effort but i really cant see this happening
Well... I guess the crew needs a diplomat in last stages of the story though. Sanji is not fit to be a diplomat as his family conquered entire North Blue in the past and double crossed the WG recently. Using a prince (even though exiled) (and even though he is smart enough to handle such dealings) of a warmonger nation is not a good idea to make dealings with WG nations, don’t you think?
Jinbe is a better option, but as we had seen in Reverie, kings and queens of WG are still extremely biased against Fishmen and prejudice, sadly is not a problem that can be solved in couple of months/years. It can be easened, but not completely solved during the story’s timespan. I doubt they would even agree to see Jinbe to make agreements.
Vivi is a double edged blade. I completely agree with you on her being too weak compared to the rest of the crew. However, she is a princess of a kingdom who had recently suffered under WG and this fact can be perfectly used to make alliances with other kingdoms.
(I took diplomacy with kingdoms into consideration in this topic, therefore, I did not consider pirate alliances. If you have any ideas that can serve as counter-arguments against my opinions, I would perfectly be willing to listen :) )