Arwen and Aragorn's children would have had human ears. By becoming mortal, Arwen chose to be counted among men as she was the daughter of Elrond, just as Elrond's brother Elros did. By doing this, their children would have been completely human and would've had the same ears as every other human.
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His sword was long his lance was keen
His shining helm afar was seen
The countless stars of heavens field
Were mirrored in his silver shield
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