Remus J Lupin

"Well, that's how it appears, yes," Hermione nodded, tapping her lower lip with the pad of her thumb. "But it's difficult to truly say. People who have gone and return, we don't know that they're necessarily the same person. We don't know that their memories are erased and bodies reset for another visit. For all we know, there might be yet another dimension that people leaving the island go to, completely separate from our arrival here."

The fear of that possibility was greater than Hermione wanted to admit.