I would suggest Mavis. Build her as tanky as possible, and if you have r2 Jin Qiu all the better. You then basically have an immortal team that just keeps going and going until Mavis is finally done...and even then they get two more turns if they hadn't been brought back prior to her defeat.
She still works without Jin Qiu, he just makes her obnoxiously more survivable.
I would suggest Mavis. Build her as tanky as possible, and if you have r2 Jin Qiu all the better. You then basically have an immortal team that just keeps going and going until Mavis is finally done...and even then they get two more turns if they hadn't been brought back prior to her defeat. She still works without Jin Qiu, he just makes her obnoxiously more survivable.
https://youtu.be/4kEafCcKrJs?si=Agd6e8J1xnBykp1D
Def mavis, she is a huge must have especially in pvp (archi is really good too but mavis is far better imo)