I've finally made it to the Grandmaster and am trying to prep to be able to manage that fight. I'm rubbish with reverse controls, so for that phase I'll need someone who is immune.
I have a 5* awakened 4/55 Wiccan that I could rank up to 5/65 and take into the fight
OR I have a 6* unawakened 2/35 Juggernaut that I could rank up to 3/45 for the fight.
(For context, I have no Professor X, Sinister, nor a 5/6* Emma for reverse immune synergies, so these two are likely my only options)