The film series will have to find The Other Darrin as Gellert Grindelwald if it wants to continue, so let the speculation begin:
- Aberforth. He and Jude Law look alike and itd make sense for him to be in this movie.
- Elphias Dodge
- Horace Slughorn
- Another Hogwarts staff member
- A member of Credences real family. Perhaps an father or uncle. (This is assuming what hes been told at the end of 2 is a bunch of BS which, imo, all the evidence suggests. )
- Someone within the ministry