Imma start with the main 5. Calli's passive should be when she deal dmg instead of just normal attacks. Gura should have increase hit rate against boss because based on her current skillset she is the best boss killer out of all the myth. Amelia's time paradox need to cost 30mp instead of 50mp and have a 25% chance instead of 50%
time stop should be 2 turn long instead of 3 i think this will pretty much balance her out. Ina's kalumina should cost 60 and nerf the dmg and have it on the "PUNisher" only instead of both. Also her "have a low percent chance of causing confusion with her normal attacks" should be removed or make it into " Normal Attacks deals Void physical damage". Kiara just need a passive rework either change it completely or when she undie, she gain slightly increase stats and a small hp regeneration until the end of the battle.
Side note: aqua skill should get a revamp especially her final skill?( the one that cost 100tp,I forgot what it called haha)