It could also be about power. Percy might realize that with Zeus out of the way, he can reshape the world of the gods in a more just and fair way. He could believe that Zeus's rule is corrupt and that killing him is the only way to bring about real change.
Some gods might be neutral. They would be more concerned with how this event would disrupt the balance of power among the gods. They might try to negotiate or find a compromise to avoid further bloodshed and chaos in the world of the gods.
One possible plot could be that the entire Greek pantheon is thrown into chaos. Percy might be seen as a huge threat, and other gods and goddesses would either try to hunt him down or form alliances with him out of fear or a desire for power. Demigods would be forced to take sides, leading to massive battles among them.
On the other hand, Percy could become more of a revolutionary figure. His act of killing Zeus could inspire other demigods to stand up against the unjust ways of the gods, and Percy would have to step into a leadership role, which would force him to grow in terms of strategy and diplomacy.
Well, it's not a very common theme. Naruto is from the Naruto universe and Zeus is from Greek mythology. Their worlds are quite different. But in the realm of fanfiction, some creative minds might come up with such a scenario where Naruto, with his ninja skills and powers, somehow manages to kill Zeus. However, it's more of a wild and out - there idea that might appeal to those who like to mash up different fictional universes in a rather extreme way.
One possible plot could be that Zeus somehow gets involved in the Naruto universe and starts causing chaos. Naruto, being the hero, decides to take him on. He could use his shadow clone jutsu to confuse Zeus and then land a powerful Rasengan on him. Maybe Zeus underestimates Naruto's abilities and is caught off guard, leading to his defeat.
In this kind of fanfiction, Percy might challenge Zeus over issues like the unfair treatment of demigods. For example, Zeus could be overly harsh on demigods who make minor mistakes while the gods themselves get away with much worse. Percy, being a hero, would stand up for his fellow demigods.
Another theme is the clash of personalities. Percy is often portrayed as a bit of a rebel and heroic, while Zeus is regal and used to being in control. In fanfiction, this can lead to some really interesting exchanges and character development as they learn to work together or oppose each other. For instance, their different views on justice can cause friction or cooperation. The story 'Power and Personality' really delves into this well.
His personality could change in several ways. For one, he might become more arrogant due to the association with Zeus. However, he could also become more responsible, realizing that he now represents Zeus in a way. He may also grow more distant from his old friends as he has to adapt to his new life among Zeus' domain, which could be full of more formalities and power plays.
There could be a fanfiction where Percy discovers a hidden side of Zeus that no one else knows. Maybe Zeus has a secret project and Percy stumbles upon it, leading to an unexpected alliance. This could involve a lot of character development for both of them.