One plot idea could be a redemption arc for Luke. Maybe Percy helps Luke see the error of his ways and they end up working together to face a greater threat. Another could be a time - travel plot where Percy and Luke meet at a different point in time, like when they were younger, and their relationship develops differently.
A plot where they are forced to team up in an alternate universe could be interesting. In this universe, they might have different personalities or abilities, but they have to rely on each other to survive. There could also be a plot about them having to hide their relationship from others in the world they live in, perhaps because of some social or political reasons within the fictional setting.
One idea could be a pre - series fanfic where Luke and Percy meet as kids before all the chaos. They could become friends briefly and that friendship could add an interesting layer to their later enmity. Another could be a fanfic where Luke is given a second chance after his fall and has to work with Percy to redeem himself. Maybe they have to go on a quest together to save someone important from a new threat in the demigod world.
One idea could be a story where Fem Percy and Luke team up against a new, powerful enemy that neither Camp Half - Blood nor Luke's former allies can handle alone. They have to put aside their differences and work together, with Fem Percy using her unique take on Percy's powers and Luke using his battle - hardened skills.
One idea could be a pre - series fanfic where Luke, Thalia and Percy's parents all interact. Maybe they are on a quest together before the whole 'Big Three' pact drama. Another could be a fanfic where Luke and Thalia have to rescue Percy from a new and powerful monster that even he can't handle on his own. It could also be interesting to see a fanfic where they all time - travel back to an important moment in the history of the gods and have to change something to save the future.
One plot idea could be Percy and Drew having to team up for a quest in the demigod world. They start off not liking each other but gradually develop a bond as they face challenges together.
Another idea is a love story where Percy falls in love with a minor god or goddess. This could involve them having to keep their relationship a secret from the other gods because it's forbidden. The story could explore the challenges they face in their relationship and how they deal with the jealousy and interference from other deities.
One idea could be that they go on a journey to a mysterious land that's not on any map. In this land, they encounter strange creatures and have to solve puzzles that are based on the unique culture there. Another could be a time - travel plot where they end up in the past and have to figure out how to get back while also helping the people of that era with their wisdom. Maybe a third idea could be that Luke gets kidnapped and Professor Layton has to use all his skills and knowledge to rescue him, facing many challenges along the way.
One idea could be that Percy discovers a hidden connection to Chaos while on a quest. Maybe he stumbles upon an ancient artifact that has the power of Chaos within it, and it starts to change him in unexpected ways. For example, he might gain new powers that are related to the primordial chaos, like the ability to manipulate energy in a more chaotic and unpredictable form.
One idea could be Percy and Reyna teaming up for a special quest that takes them to a mysterious and dangerous new realm. They have to rely on each other's skills, Percy's water powers and Reyna's leadership and combat abilities, to survive and complete their mission.
One idea could be that Percy and Elsa meet when some sort of magical rift pulls them into the same world. Percy's water powers and Elsa's ice powers could either clash or combine in interesting ways. For example, they might have to work together to stop a new threat that is causing chaos with water and ice elements in the merged world.
One idea could be Percy having to face Kronos in a dream realm where Kronos tries to manipulate his mind. Maybe Kronos shows Percy a false future where his friends turn against him to make Percy doubt his alliances.