Character poem #34) The Lutece Twins Robert and Rosalind (Bioshock Infinite)
Technically they're the same person (being alternate reality/timeline versions of the same existence) so I'm counting them as one character for the challenge. Having tight bonds with my own dear sister X3 I was instantly attentive to these characters. More so because unlike most, they were the same person, and yet two different people. Ackpth, I could go on with the crazy physics stuff, but that's better left to the Luteces. More importantly came their role in the story and their sad, yet fitting fates. Robert probably has to deal with numerous physics-shenanigans-related problems (conflicting memories, nosebleeds, and such) but despite what his experiment caused does he really consider having Rosalind with him as worth the trouble? That's a thing only siblings can answer for you. (And I say yes :3 meep)
Hugs, has hugged, will hug. It's all a matter of perspective, but there are constants among the variables.
The Luteces belong to Irrational Games