And how about this one: Yavanna and Aule. Talk about opposites attracting! ...
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Yavanna: Now let thy children beware! For there shall walk a power in the forests whose wrath they will arouse at their peril."
Aulė: Nonetheless, they will have need of wood.
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She's the embodiment of Nature, and he's the more industrial type... yet this seems to be more than your average marital tiff! They seem to be happily wed, though, so who knows?