Agree that MoS is candidate #1, or at least an heir (genetic or otherwise) of his.
Child of Aragorn/Arwen vs Son of Mouth?
However, if it were follow the Tolkien formula, it would be a few thousand years later, and so we'd be talking descendents.
As for the Blue Wizards, who's to say? Now that fellow Maia Sauron and Saruman were literally 'blown away,' Gandalf on a one way cruise and with all of the power elves (Big E, Big G, Big C) leaving the scene, the West (as these guys are out starting cults in the East) may look like easy pickings.
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