Anyone who wants to take over this story can do so.

The main things you are to include are:

The potters and allies arrive in the One Piece world a few years before the battle of marinefold and they aid in the rescue of Ace. They do not contact Ace or Luffy before this point (this is optional and you can change this)

Due to their arrival whiteboard survives and with the magical healing gets stronger and healthier.

Pairings: Ace/Kai, Sabo/Luna, Sirius/Remus any others are up to you.

People mistake their magic or animagus abilities for devil fruits.

Every member of their crew has an enchanted amulet which gives protection and a permanent portkey to the ships medical bay. The ship is enchanted with space expansion and is near indestructible.