After more thought, I'm going to make Lydia Creel. I can already think of a few reasons she'd want to and/or could end up on the island. I think with this cast and setting, she would be a more interesting character to play

She might not have the X-gene (Her power is more Alien/Magical in nature) but it is linked to Loki (He created the potion that gave her father his powers), and it would also draw comparisons to Rogue's power