It's bound to happen, we've been with the Straw Hat Pirates for over 700 episodes and had some great times with them. But one is bound to die, which one will kick the bucket before the series ends and why?
I honestly think none of them are going to die during the series. Ace already served the purpose of getting stronger to protect friends. Buffy may die after achieving the One Piece similar to Roger but other than that.... I don't think any one will.
I think it might be zoro because if he dies it will mess everyone up and zoros death would be the most tragic. Zoro has already shown that he is very loyal to luffy and would even die for him. If anyone else dies it would be REALLY sad but if zoro dies it would awful. His death would be like aces and ace was one of my favorite characters.
It might sound weird but I think if any of them are going to die it will be Zoro. He is the most loyal to Luffy and he's come close to death a number of times. You can only cheat death so many times before your luck runs out. He'll probably die protecting Luffy.