Well, a great plot for 'Atlantis: The Lost Empire' fanfiction could be a love story between a character from the expedition team and an Atlantean. It would involve them trying to bridge the gap between their two very different cultures. Also, a fanfic could focus on the political intrigue within Atlantis. There could be different factions vying for power after the city was rediscovered. And then there's the idea of a fanfic where the Atlantean magic starts to spread to the modern world and the chaos and wonder that would bring.
One idea could be exploring the backstories of the secondary characters more in - depth. For example, what was the life of the mechanic before joining the Atlantis expedition? Another could be a story where the Atlanteans start to rebuild their civilization above ground, facing new challenges. Maybe a third idea could be a time - travel fanfic where modern characters go back to the prime of Atlantis and see how their technology and culture were at their peak.
Well, an interesting plot for an Atlantis the Lost Empire OC fanfiction could be an OC with a special connection to the Atlantean crystals. Maybe the OC discovers that they can communicate with the crystals in a way no one else can. This could lead to uncovering secrets about Atlantis' past and future. Or perhaps an OC who is an outcast in their own world and finds acceptance in Atlantis. They could bring new ideas and skills to the Atlantean society, like a new form of art or music. Also, an OC could be a time - traveler who ends up in Atlantis. Their knowledge of the future could either help or endanger Atlantis, depending on their actions.
One interesting crossover could be Naruto's ninja skills in the world of Atlantis. For example, his ability to use shadow clones could be used to explore different parts of Atlantis simultaneously. Maybe he could also use his Rasengan to break through some of the ancient defenses in Atlantis. Another aspect could be the sharing of chakra with the Atlanteans. Since chakra is a form of energy, it might interact in unique ways with the magic or technology of Atlantis.
A fanfiction could involve a character from Atlantis having some sort of magic ability, similar to the wizards in Harry Potter. This character could travel to the wizarding world and learn about their magic, and in turn, teach the wizards about Atlantean technology. For example, they could show the wizards how to use some of their advanced healing devices.
One plot idea could be that the male OC is a spy sent by a rival group to steal Atlantean secrets. But as he spends time in Atlantis, he starts to question his loyalty. Another idea is that he is the only one who can decipher an ancient Atlantean prophecy that foretells a great danger to Atlantis, and he has to team up with Milo and the others to prevent it.
The theme of adventure also runs strong. In crossovers like the one with 'Indiana Jones', the sense of adventure from both universes is amped up. Characters are constantly on the move, exploring new places, and facing dangerous challenges as they navigate the combined worlds of Atlantis and the other franchise.
One common theme could be adventure. Since Atlantis is a mysterious and lost place, fanfictions often involve characters going on exciting quests within the empire. Another theme might be love and relationships. Given the 'lemon' part, it could focus on more intense romantic relationships among the characters.
One idea could be a power struggle within the empire. Maybe a young noble rises to challenge the established ruling class. Another could be an exploration of the empire's relationship with a mysterious alien race. It could lead to a story of cooperation or conflict.
Adventure is a very popular theme. The idea of exploring the lost city, facing its mysteries and dangers is exciting. For example, stories about navigating the underground passages filled with traps.
Maybe Percy is sent on a quest to Atlantis because there are rumors of a traitor among the Atlanteans who plans to side with the Titans. Percy has to navigate the complex political situation in Atlantis and figure out who the traitor is before it's too late. He also has to deal with the Atlantean magic which is different from what he's used to.
One idea could be that Hogwarts students discover a hidden portal to Atlantis during a Care of Magical Creatures class in the Forbidden Forest. They then have to navigate the ancient Atlantean society, which has its own form of magic. Maybe they need to team up with Atlantean wizards to defeat a common dark force that threatens both their worlds.