One interesting plot could be Percy getting a new and extremely powerful ability blessed by a previously unknown god. This could lead to him having to face a new set of challenges and enemies that are specifically drawn to his new power.
Chiron, the centaur trainer at Camp Half - Blood, is often included. He has a vast knowledge of the gods and their ways, so he can guide Percy through understanding the nature of his blessings. He can also help Percy train to control any new powers that come with the blessings. Additionally, some fanfictions might include new or minor characters who are either the cause of the blessings or are affected by Percy's new - found status after being blessed by the gods.
He might gain extraordinary powers. For example, he could get enhanced strength from Ares that allows him to defeat powerful monsters with ease. Or he might receive wisdom from Athena that helps him solve complex problems and outwit his enemies.
The blessings can also open up new paths for his adventures. Say he gets blessed by Hermes. He might be able to travel to places that were previously unreachable or travel at a much faster speed, which could lead to him exploring new regions of the mythological world and uncovering hidden secrets.
Perhaps the blessings make Percy a target. Other demigods or villains might be jealous of his new status. He then has to deal with the envy and threats while also trying to figure out how to fully utilize the blessings in a positive way. For instance, the gods' blessings might come with some sort of side - effect that he has to overcome as well.
Well, Percy Jackson is obviously one of the main characters. He is the one who is blessed by Hestia. And we can also expect to see his friends like Annabeth Chase. She might play a role in how Percy uses or understands his new blessing. Another character could be Grover, who would support Percy during his adventures with the new powers or situations brought about by the blessing.
In such a fanfiction, Percy might gain new powers. Since Khione is the goddess of snow, Percy could be blessed with ice - related abilities. For example, he could control ice, freeze water in a unique way, or even withstand extremely cold temperatures better than before. This would change the way he battles enemies and interacts with his environment.
Well, one possibility is that Percy, being blessed by Zeus, could face a moral dilemma. On one hand, he has his loyalty to Poseidon, his father. But the blessing of Zeus comes with certain expectations. He might be caught in the middle of a power struggle between the two gods, and have to decide how to use the new - found powers without angering either of them.
Obviously, Percy Jackson himself is a main character. Since he is the one blessed by chaos. He's the hero of the original series and in the fanfiction, his character is likely to be further developed with this new element of chaos.
Other jealous demigods could act as antagonists. They might feel that Percy doesn't deserve the blessings and try to undermine him. They could spread rumors or even try to sabotage his quests to make him look bad in the eyes of the gods.