A powerful sorcerer or wizard from within Atlantis who has his own designs on the throne could be an antagonist. This character might see Harry as an obstacle to his own power - hungry plans.
One possible storyline could be Harry's journey in learning the complex politics of Atlantis as the crown prince. He might face challenges from rival factions within the underwater kingdom.
It could be about a unique crossover where Harry Potter somehow becomes related to the Prince of Atlantis. Maybe it involves Harry's magic in the underwater world of Atlantis, or a quest that combines the magical elements of the Potterverse with the mythical and underwater aspects of Atlantis.
Obviously, Harry Potter would be one of the main characters. And there would probably be some Atlantian characters like the King or Queen of Atlantis, or other important Atlantian figures. Maybe some of Harry's friends from Hogwarts could also be involved, like Hermione and Ron, if they also get dragged into the Atlantis adventure.
There are fanfictions that blend the royal and magical worlds. In some, the Crown Prince might be a secret wizard all along. He could attend Hogwarts undercover, and his path could cross with Harry's. A great fanfiction might explore how their different upbringings - one in royalty and one in the wizarding world - shape their views and how they learn from each other. You can find such fanfictions on platforms like FanFiction.net or Archive of Our Own by simply searching for relevant tags like 'Crown Prince' and 'Harry Potter' combination.
There were different opinions on whether the Third Prince was the Crown Prince or not. Some documents stated that the Third Prince of the Qing Dynasty was the Crown Prince, while others believed that the Crown Prince and the Third Prince were different people. According to the relevant documents, the Crown Prince was the Qing Emperor's eldest son, and the Third Prince was the Qing Emperor's fourth son. Although the Qing Emperor initially wanted to support the Crown Prince as the successor, he eventually abolished the Crown Prince and placed the Eldest Princess under house arrest. In the plot, the Third Prince became the Emperor of the Qing Kingdom. Therefore, according to the information provided, the Third Prince of the Qing Dynasty was not the Crown Prince.
Yes, there are likely some fanfics out there that blend the two. Some fans might be intrigued by the idea of Harry Potter characters exploring the lost city of Atlantis, with its own unique magic and secrets. It could involve Harry and his friends on a quest in Atlantis, facing new challenges and perhaps even learning new types of magic.
The Crown Prince and the First Prince were not the same person. The Crown Prince was older than the Eldest Prince. The Crown Prince was conferred the title of Crown Prince the moment he was born and was not in the Prince Sequence. The First Prince's mother was not the Empress. Thus, it could be concluded that the Crown Prince was not the Crown Prince.
Well, it's very likely. Since fanfic writers are extremely creative. They often take the basic elements of the Harry Potter world and blend in all sorts of new concepts. A 'Crown Prince' concept could be used in a number of ways, perhaps as a new character in a story set in a wizarding kingdom that's related to the main Harry Potter story. So, searching for it on popular fanfic platforms should be your first step.
Obviously, Percy Jackson is one of the main characters. He is the son of Poseidon and has his own set of powers and a strong sense of justice. Another important character could be the current prince or princess of Atlantis. They might be Percy's ally or rival, depending on the story.