They don't necessarily "represent" certain Valar (though later we see Yavanna really did send Radagast to represent her or her ideals); they just come from the people of those Valar. In Valinor, it seems all Maiar were associated with one Vala or another. Alatar and Pallando were Maiar of Orome.
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...take counsel with thyself, and remember who and what thou art.
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