Since the finale is delayed. I’ve theorised what might happen.
1. Adrien will find out the truth, and discover Ladybug is Marinette, it could be a one sided reveal. People have said this on X too, and I agree, it’s hugely possible and a very interesting theory.
2. Either Marinette breaks up with Adrien or he breaks up with her. I have a feeling either one is going to leave each other. Marinette has already mentioned about breaking up with Adrien, due to this heavy burden she’s carrying.
3. Ladybug will find out about Vesperia being Fury. I have a feeling she will take back the bee miraculous and give it to a new holder, possibly Sublime, Diane or Aglae. Not too sure though.
4. Adrien will turn his back on Marinette and lose trust in her. Yeah I feel like he’s going to be turning his back on her for a while, because of how much she’s lied to him about his father. I also feel like he’s will turn his back on Felix and Kagami too since they’ve also known the truth and they haven’t told him, leading him to feeling betrayed and hurt. I also feel like he will go and stay with one of his grandparents after finding out Nathalie had also lied to him and was Gabriel’s accomplice.
5. Alya will turn her back on Marinette but not for long. She will probably stay angry at Marinette for a couple of episodes of season 7, and then make up with her, realising Marinette did it to protect Adrien and she’ll probably give Marinette some home truths on how wrong it is to lie.
These are just my own theories, doesn’t mean it’ll actually happen. Maybe season 6 might have the worst finale. You never know.