beat me to it.. Mystia is broken. Kaggy is at least on the slower side, AND none of her good attacks are non-elemental. Mystia goes first very often, has power, and doesn't get dumbed down by elements.
Flan is broken for trash too. I mean, in my current playthru, I honestly don't see her as good a bosskiller as I hoped. Starbrow break is powerful yes, but it's not any more powerful than KOi3 or megawatt, or Eiki's nuke, etc. Granted, Flan is fast, and the spell has average delay, so she can definately spam it for better dps than anybody. But she's so squishy, and the fact that it hurts her means that even a simple spirit wind or whatever can take her out after spamming break. So you're pretty much forced to use just 1 at a time, and in that situation, wtf are you using flan and not Nitori/Yuugi/etc if not for her amazing trash potential? To make matters worse, as she levels up more and more, her defense falls behind more and more from her attack and her starbrow break goes from being a minor ding, to a holy shit I just nuked the shit outta myself penalty. I mean Flan's health is good, so early game you CAN keep her out for an attack and take a hit because her hp, but later on when break mauls her a new one.. it's risky.