I'll let someone else to answer this more fully, but I know that Elrond & his descendants have the choice to be immortal or mortal. Arwen chose to become mortal. And one of Aragorn's far-far-away ascendant was an Elf. I think it was a somehow closer ascendant of Elendil, father of Isildur, ascendant of Aragorn. But considering that ascendant was so far in the past, Aragorn is very human. Someone will have to explain the presence of elven blood in the Númenóreans, please!
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