LOL Nah, it's not really an AU, it's just incarnations of Immune characters, or new characters altogether, in a new setting. Like, I have Raine and Stephen (wip), who are kind of incarnations of Rae and Evan, and then I have Cameron, who's different entirely.
You can totally bring in an incarnation of Ellie though! I'd love to see her and Lucas, since I know Liz is bringing in an April!