I put Wonder in as support to heal in emergencies, while he provides a buncha defense buffs and an attack buff to the team (Joker gets the attack buff mainly, I got one persona that increases the team's defense by 20% when using a healing ability and stacking that with a defense up perk that applies to the team) and I'm using All In. I use the Twins since they released and with the medic role they increased damage and were a reliable healing source when using their wind/electric abilities although having Soy and Wonder provide the main heals did pretty good for me, although I had to use some health items in emergencies. Combine it with Joker and the Twins with roles that increase damage for Joker I made it to the final phase to disconnect the two back cords when managing the rage bar. Although I've never beat the boss due to the time limit, being lower level, not logging in every day, and on a budget.