AO3 is a great place to find 'Danny Phantom Prince Fanfiction'. It has a tagging system that allows you to narrow down your search specifically for stories about Danny being a prince. Fanfiction.net also has a good amount of these types of stories. You can also try searching on Tumblr. Sometimes, fans will post links to their 'Danny Phantom Prince Fanfiction' on their blogs or in relevant Tumblr groups.
I would recommend 'Danny Phantom: The Prince's Quest'. In this fanfiction, Danny's journey as a prince is filled with challenges. He has to deal with power - hungry ghosts who want to overthrow him. The author does a great job of creating suspense throughout the story. There's also 'The Royal Danny Phantom' which is really interesting as it explores Danny's dual identity as a normal teen and a prince in the Ghost Zone.
One unique feature is the combination of royalty and the supernatural. It's not often you see a character like Danny, who is a ghost - fighting hero, also being a prince. This creates a whole new set of storylines and conflicts.
One common theme is the struggle between Danny's two identities. As a prince, he has certain expectations and responsibilities, and as Danny Phantom, he has his ghost - fighting duties. Another theme is often about leadership, as he has to lead in his princely role.
There are many out there. Some fanfictions might take a darker turn, where Danny as the ghost prince has to face more dangerous threats not only from the ghost world but also from humans who fear his power. These stories often add a lot of depth to his character and the whole Danny Phantom universe.
I've also come across 'Danny, the Phantom Prince'. This one delves deep into the idea of Danny being a prince in a world where ghosts and humans co - exist. It explores his relationships with his friends and family in this new context. There are some great character developments in this fanfiction, especially how Danny's friends react to his princely identity and how they all work together to face the challenges that come with it.
Well, it combines the unique world of Danny Phantom with the concept of royalty in the ghost realm. Fans love to see how Danny navigates this new status. His relationships with other characters, both old and new, can be explored in really interesting ways. For example, his interactions with his ghostly subjects or how his human friends react to his new title. Also, the fanfiction can explore the politics and power dynamics in the ghost world, which adds a whole new layer of intrigue.
One great fanfiction could be where Danny has to deal with new threats in the Ghost Zone while trying to balance his life as a prince and a human. Maybe he forms an alliance with some unexpected ghosts to protect his throne.
Another antagonist could be a human with a grudge against Danny. This person discovers Danny's 'Prince of Darkness' potential and decides to use it against him. They might team up with some lesser ghosts and use dark magic or technology to try and take Danny down. They could be motivated by jealousy or a desire for power.