Quote:
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Their task was to circumvent Sauron: to bring help to the few tribes of Men that had rebelled from Melkor-worship, to stir up rebellion ... and after his first fall to search out his hiding (in which they failed) and to cause [?dissension and disarray] among the dark East ... They must have had very great influence on the history of the Second Age and Third Age in weakening and disarraying the forces of East ... who would both in the Second Age and Third Age otherwise have ... outnumbered the West. —"Last Writings", The Peoples of Middle-earth
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https://tolkiengateway.net/wiki/Blue_Wizards
Personally I think the it is one of the Blue Wizards. Mostly because Tolkien didn't develop their storyline at all, and therefore the writers have a lot of freedom.