DocFrance focus on killing one enemy at a time, especially the ones with the most powerful attacks (like Hazer). Try using Cyan's Retort for big counter damage. Also have your ghosts possess the hardest monsters. I hope that helps.

Repo Man is supposed to cast Flare on himself. Flare is one of Repo Man's sketch attacks meaning he must cast the spell in battle. However there is no way Terra can survive Flare so early in the game so instead of creating a cheap instant death situation for the player I had Repo Man cast Flare on himself.