There are many powerful and mysterious devil fruit that we have seen in one piece yet and there are many more that will come.
So which devil fruit you want to see in the future arcs in one piece or what do you think can be a powerful devil fruit in the future and who has that fruit.
Or the powerful devil fruit yet to discover.
My review -Time-Time fruit (that can control time like doctor strange) and may be shanks has it due to his sudden entrance at Marine fort.
So which new devil fruit you think we see in future.