Spider-gwen, she actually got me through a lot of the earlier content. This was pre 12.0 so she was pretty garbage back then. But I didn't know any better.
Mine was Gambit from a 4* crystal. Didn't mind him because he can stun lock by chaining Sp1's and a pretty decent ability accuracy reduction on Sp2 which helped me through the campaign.
Comments
Single handedly let me start clearing stuff I was struggling against with mostly 2* and a few random 3*.