i got some feedback to say in relation to combat since i decided to play the game now with it update,here my thoughts for each character
Marcy skills are all good and dont seen need to be fixed as far i think so, only thing i can say about so is suggestion on her magic skill, but i dont think it need any buff at the moment as it kinda only need when necessary, but marcy can defeat all the knights with out using the bath once
you already buffed Vepar Abyssal Sting by adding a third stack to the skill,but i think due for the cost of the skill it can be bit slow to stack the poison,but i think instead of changing the TP cost,you could probrally increase a bit the damage the sting itself does, eitheir making it a 3-6 damage or 3-8 to patch up for the tp cost, speaking of her skills, her magic Obfuscation seen to rather lack the blindness, it maybe that the bats got luckier but through the uses,it seen that it almost they nearly never miss, idk for certain but it may need to increase a bit how much the enemies may miss from the skill status(the attack debuff is ok)
Lastly,while gremory magic is as good at it is, i think the flaw is on her skill Occultic Acumen, aside that it can restore the mp ,the hp healing not as effective,so far on the game play the skill can restore the mp enough for 1 use of her magic,but the healing is kinda low,only healing 2 points per use of the skill,but due for her lack of def,the knights can damage as faster than she can heal,which could be a problem that she would require other ways of healing(and idk if ya plan to give her a healing magic futher on the story),so the only fix on this skill is to increase the hp heal for a bit, 4 hp heal might be fine enough