The consequence

Marinette was almost akumatized. But an akuma that is cataclysmed reaches her heart.

The consequences?
Marinette must be a hero when there is danger, even when she doesn't want to be.
Using the cat miraculous makes her weak for a short period of time.
Her personality will sometimes change to that of her alter egos.

Marinette moves to Gotham to steal miraculouses. Becoming a thief, to throw off the balance of being a hero.

(Only the plot is mine.)