For Parasoul you can use characters that can control the area (like Peacock or maybe Valentine), because Parasoul is generally a "hand to hand combat" character , so she will try to approach you, but if you don't let her, you will surely deal damage and win advantage against her (yeah, you said that she has long range special movements and blockbusters but it's hard to "chain" with normal attacks so just pay attention to block them)
And Filia, you can save your TAG INS to use when your character are suffering heavy bleed (if you don't have bleed resistance). And fight against her with characters that has a great amount of HP (like Big Band or Valentine) to resist the damage she deals because of the ability that she has.