I was just browsing trough some old threads and stumbled on this one. While reading, a thought broke to the surface:
People talked here about Aragorn (and his ancestors) having Maiar 'blood' in their veins. The problem is, Maiar had no blood, for they were naturally
discarnate. They could clothe themselves with a body (hroa), though, and having worn that hroa long enough, they could even become incarnate, eventually. (See also obloquy's article
Ëalar and Incarnation.)
Melian the Maia
did clothe herself with a body, after meeting Thingol. What kind of body? A Maiar body?
No, for such a thing doesn't exist. So, she clothed herself in an Elvish body! So, her blood was also Elvish blood. An therefore, none of here descendants had Maiar blood, but only Elvish, or mixed Elvish - human.