>As in, “Who am I if I’m suspended in a vacuum free of the bounds of history, evolution, time and space?”

That would be a trick question. I am who I am unlike my "parallell universe twin" that had coffee this morning instead of cereal but looks identical in every other way, he is who he is, he has his identity and I have mine. He exists in a universe that had a slightly different beginning (Big Bang or whatever) and will have a different end (Butterfly Effect) and I exist in this one. This universe is this universe (past, present, future) and that universe is that universe (past, present, future) and if you took me and my twin out of those universes before we had breakfast this morning we would still be who we were, we just would be unable to tell the difference as we were not born with birthmarks, mine saying "Made by Big Bang A"´, his "Made by Big Bang B".