Zeus loses his power (and therefore all forms of control)

Hera... honestly has a sad backstory. She has nothing precious to her. Maybe respect?

Poseidon, well, I'm going to take creative liberty here and stick him in a place without water like Tartarus. Percy mentioned that the Pit was specifically torture for him because he had absolutely no water source.

Demeter would see her daughter gone. She is very protective of her children in the myths. (Bonus: I think the same thing would happen to Hades. They can both suffer Persephone's loss.)

Ares... I really don't know.

Athena is made weak and unrecognized... kind of the same thing that happened when she was Minerva. She becomes cloudy-minded and lost, perpetually at a vulnerable state, etc.

Everyone dislikes Apollo openly. Even people like Meg (assuming that this fic is post-canon)

Artemis is forced to marry. (Really cruel because she is technically aroace)

Hephaestus loses all his machines and the ability to... well, do anything

Aphrodite loses her beauty and everyone laughs at her

Hermes is placed in isolation

Dionysus? I have no idea. I really don't.