I was reading known events and would it be acceptable to make a character that had been experimented on by the scientist from the Pax Metahumana story? I was thinking she could have gained her powers from that and think of them as some sort of curse kinda thing. 
If so if anyone has already established how long he's been planning this and how he experimented and stuff, I would really love to know to see if it would work with my character :)