I personally don't think he's a maia, since tolkien throughly covered that topic. My best guess is that he is either a forest spirit watching over the world, or a man who has been taught magic by the Istari! But that's just me...
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'But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.'
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