Rafael

I think the most interesting thing about the starwhats is that they adapt quickly about who is the vice-leader dependind the situation. At sea, Nami is usually the no. 2 navigating and giving tasks to everybody to keep the ship on the route and/or avoiding dangers. In battles Zoro is usually the combat leader because second to Luffy he's the best to break lines with an area spread attack and lead an assault while Sanji is the stategy leader due his best tactical vision, speed and stealth to sometimes guide and sometimes do the job himself.