The first season of The Lord of the Rings: The Rings of Power loved its mysteries — a secret Sauron, a spooky sword, and an ...
So, if the Stranger is Gandalf, then that means the Dark Wizard is either Saruman, Radagast, or one of the two Blue Wizards.
Read More: There's a Deeper Meaning Behind the Wizards in The Rings of Power Given the Dark Wizard does seem to have a cult following, there's a good chance he's one of these two blue wizards.