
As is clear from the meaning, we are dealing with "dark doubles". What are your options? The first ones that came to my mind were Daken (although he can be viewed in different ways), Madeline Pryor (vs. Jean Grey) and maybe Iron Monger (vs Iron Man)... But for some reason I want to believe more that it is Madeline Pryor. In fact, there are quite a few such champions, but I think we can come to the right answer.