What role the crew even need at this point? This question got asked many times here I know but still
Oda could just asspull a role for whatever, but other than that…
Lookout is the one role which is the least one needed for a captain like Luffy. Someone like Ussop can do that too and I dont think there is person other than Viola maybe who could do it better. Carrot could fit role, but she got sidelined, no dream, no sad backstory, she missed her chance.
Strategist same problem. Luffy never listens whats the point? Law is definetely the best option, he is the Shikamaru of One Piece. Sad backstory, dream, an enemy Luffy fought. I dont see Law as a doctor, more as a strategist. But he wants to be his own boss. Also Bepo.
Cabin boy got mentioned often times. Kids fighting endgame enemies makes no sense. Every member should have reached highest potential at the end. A kid could never reach that. Maybe Momo but he has the stay in Wano.
Chronicler role got mentioned often times too. Yamato is the only option here imo. I cant imagine someone other than Yamato loving this role so much. Sad backstory, dream, an enemy Luffy fought, and on top of that she knows Luffys true dream.
Just a idea: A chronicler joining would give the anime some time to breath in form of filler episodes. Every episode she could ask a member and write everything down, how they met Luffy and what adventures the crew expierenced together and whatnot.
Quartermaster: Nami
Guardian left behind is just sad
Portable storage/fridge. Caribou. Guaranteed.
Its either
Yamato (Chronicler)
Vivi (nothing to do with role)
Bonney or Kuma (because they get focus now, role idk)
But tbh I think the crew is full. Just some thoughts…