I’m intrigued, and I’ve got a shapeshifter criminal character that would be so fun. Maybe this group tracks him down and convinces him to join (perhaps just for one mission at first but he sticks around). Takes a criminal to catch a criminal, etc. He’s a shapeshifter (can be animal and humanoid but can’t copy mutant powers) and so he’s got a lot of power, but if our other characters are very powerful and our big bass are ah, well, big, it can work well. He does have some built in power limits too so that helps.