Arwen, the Istari are definitely Maiar, in the Sil, it mentions Olorin, wisest of the Maiar. As to Tom Bombadil and Goldberry - Tolkien never said that either of them were Maiar, in fact he never said what they were at all.
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`A blunderbuss, was it?' said he, scratching his head. `I thought it was horseflies!'
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