Mystique
Over the years of playing this game I have seen people ask for Mystique and I dig it she should be here. But it shows how much people really know of marvel comics. Everyone wants her to change into and have all these other characters powers. When she doesn't have that power and never did. She is a shape-shifter yeah and 1 of the best yeah but she can't use powers. The constant talk of ways around this for kabam from the community shows how oblivious the community is to the world of marvel in a whole. It's senseless she's an assassin use that as her base. Maybe use her shifting abilities in level 3 to confuse the character before the kill shot. Be it shifting someone like 1 of the elders or the summoner during, which places disorient or concussion on the opponent. More realistic to her character.