... oh christ. Yeah, sure, those exist. It's difficult to see anyone using them, but sure.Such as?
Joan certainly has her uses, as she allows you to skip content mechanics once per fight usually. But that leaves you with other problems - actually making use out of the extra time you gained. That extra time is usually only one or two turns more. So having a team which:
1. Can't skip the mechanics of the fight with pure damage output
2. Can run Joan with her reduced damage output, and still have enough damage to clear with the extra turns you gained
It is possible, but that's a really narrow window. I suppose to existence of Triggers makes Joan more than "survive one extra Overdrive" since threats in a fight can happen outside of Overdrives now.