One idea could be Percy discovers a new underwater civilization that is in danger from an ancient sea monster. He has to use his powers and wits to save them.
Annabeth would be a great character to include. She could use her intelligence to help Percy solve problems and strategize against their enemies in the underwater world.
The demon lord in Percy Jackson fanfiction often serves as a powerful and menacing antagonist. They usually possess extraordinary powers that pose a great threat to the demigods in the story. For example, they might have control over dark magic or be able to summon hordes of monstrous creatures.
It could be a powerful, ancient Titan who was banished long ago and has now returned for revenge. Maybe Kronos has an even more evil and powerful form that he takes on, becoming the Dark Lord. He wants to destroy the new order of the gods and demigods that has been established since his last defeat.
One idea could be to have Percy Jackson end up in Middle - earth. He could use his water - related powers to help in battles against Sauron's forces, like using water to put out dragon fire. His demigod skills would be a new element in the LOTR universe.
When creating the plot, find a good balance between the two worlds. Don't make it too Percy - Jackson - centric or too LOTR - centric. Maybe start with a problem that can only be solved by the combined efforts of characters from both series, like a new threat that needs demigod and LOTR hero powers to defeat.
One great 'Percy Jackson: Lord of Time' fanfiction is 'The Time - Twisted Quest'. It takes Percy on an adventure where he has to battle time - warped monsters. The author does a great job of keeping the characters in - character, especially Percy with his sarcastic yet brave nature.
The demon lord can greatly impact the story by creating high - stakes conflicts. Their presence forces the heroes, like Percy and his friends, to step up and use all their skills and powers to combat the threat.
One interesting theme is the clash of different mythologies. The Greek mythology of Percy Jackson and the high - fantasy mythology of Lord of the Rings coming together creates a unique dynamic. Another theme is the idea of heroism in different contexts. The demigods' heroism in the Percy Jackson series is different from that of the heroes in Lord of the Rings, and fanfictions often explore how they can learn from each other.
The popularity of 'Percy Jackson: Lord of Time' fanfiction lies in the fact that it combines two very appealing elements. First, the Percy Jackson series already has a huge fan base. Second, the idea of Percy as the 'Lord of Time' adds a whole new layer of intrigue. It allows fans to explore different powers and adventures for their favorite character.