In a Percy Jackson King of Alagaesia fanfiction, the plot could center around Percy's journey to understand the magic system in Alagaesia. He might meet Eragon - like characters and exchange knowledge about their respective powers. Percy could also find that there are underwater secrets in Alagaesia that are similar to the mysteries of the ocean in his own world. This could lead to a quest to unlock some ancient power that lies beneath the waters of Alagaesia.
Well, one possible plot could be Percy using his water - controlling abilities in the world of Alagaesia. Maybe he teams up with the local heroes there and they face some common enemy. For example, a powerful dragon that is threatening both the demigods' world and Alagaesia. He could also introduce new combat styles to the people of Alagaesia based on his training at Camp Half - Blood.
The plot might involve Percy getting lost in Alagaesia. He then has to figure out how to get back home while also getting involved in the local politics and power struggles. Since he's a demigod, he might be seen as a powerful ally or a threat. He could end up using his knowledge of Greek mythology and his own powers to outwit the various factions in Alagaesia.
It could be an ancient and powerful dragon that has been awakened by the arrival of Percy in Alagaesia. The dragon might see Percy as a threat to its rule or territory and decides to go after him. This dragon could also have some special abilities that make it difficult for Percy to defeat, like being able to nullify his water powers for a short time.
Well, he might get into all sorts of adventures. He could meet the dragons in Alagaesia and try to use his water powers to his advantage against them. Maybe he'd team up with the local heroes there and learn new combat styles.
Eragon could be one of Percy's allies. Eragon has his own set of powers and knowledge of Alagaesia. Percy and Eragon could combine their skills, with Percy's control over water and Eragon's magic and sword - fighting abilities. They could also share their different cultural knowledge, Percy from the world of Greek mythology and Eragon from the world of Alagaesia.
One possible plot could be Percy Jackson having to navigate the complex politics of Rome as the King. He might face challenges from rival factions within the Roman demigod community who don't want an outsider like him in power. He could also be tasked with protecting Rome from new and powerful monsters that are specifically targeting the city because of his rule.
One possible plot could be Percy Jackson having to face new challenges after becoming the King of the Titans. Maybe he has to deal with the other gods who are jealous or afraid of his new power. He might also try to reform the Titan realm, making it less about domination and more about harmony.
The plot might involve Percy's journey to becoming the king of the void. He could start by accidentally stumbling into the void. There, he discovers that there's a power struggle going on. With his friends' help, or maybe on his own, he has to prove himself worthy of being the king. He might have to face challenges like taming wild and otherworldly beasts, or solving ancient riddles that are the key to ruling the void.
One possible plot could be Percy discovers he has a special connection to the Hellhounds. Maybe he is able to communicate with them in a way no one else can. He then has to use this ability to solve a mystery in the demigod world. For example, some important items have been stolen and the Hellhounds know where they are, but they will only tell Percy.
Well, it could be about Percy using his demigod powers in the unique Alaskan setting. Maybe he has to deal with local mythological creatures that are specific to Alaska and assert his rule as the 'King of Alaska'. He might form alliances with native Alaskan demigods or spirits.
Well, perhaps in the fanfiction, Percy is summoned by the 'King under the Mountain' because of his reputation. The king wants Percy to retrieve a powerful and ancient artifact that was lost in a dangerous part of the mountain. Percy teams up with some of the king's bravest warriors. Along the way, they face all sorts of mythical creatures like trolls and goblins. Percy has to use his wits as well as his powers to overcome the obstacles and claim the artifact.