#i think it's probably elrohir who goes and elladan who stays but i'm not completely set

[anghraine]

Just thinking about my headcanon that Elladan and Elrohir are both temperamentally inclined towards Men (and the Dúnedain particularly), and despite the difficulties and complications, would likely have both chosen the fate of Men had not Arwen chosen mortality.

But it's not that Arwen's choice wholly determines theirs. We know they have to consider their choice and that they delay making it. It's not an easy or obvious thing for them.

Still, the prospect of Elrond and Celebrían losing all their children to Elros's fate hangs heavily over their thought processes and quiet discussions and so forth. Ultimately, despite their personal inclinations, one of the twins decides he can't do that to their family and people, and makes the choice of Elwing.

And the other doesn't.