I've been thinking about a solo black mage beating FFZZ with just Conf and Bane. The developer of this hack said, "It is not possible to complete any special challenges in FFZz, such as hardcore runs, duos and solos." I think I can prove him wrong in this TAS. Confusion and Bane will probably finish off all the enemies. This TAS makes it to the Marsh Cave, after beating the Pirates with only 2 characters remaining.
Edit: I found there is a room on the second floor of the marsh cave, with a spike tile. The enemies on that tile have a lot of health, and I needed to confuse them to win as fast as possible. I used another Confuse on the fight before the miniboss, but I was out of MP for the Wizards and Sorcerer. I will need to level up to 5 or something before the Marsh Cave to have a chance at coming out alive.
Edit 2: I just realized that I could buy another Conf. However, gold is a bit tight, so I'll have to win more battles.