Perhaps a story where Dracula tries to redeem himself. He starts to question his past actions and attempts to make amends. He could start by protecting a small village from other dark creatures, which would surprise the villagers who have always feared him.
Another plot could be Dracula falling in love with a mortal who has a special power. Their relationship would be forbidden and they'd have to fight against the forces that want to keep them apart, both from the vampire world and the mortal world.
One idea could be Dracula forming an unlikely alliance with a vampire hunter. Maybe they both realize there's a greater evil threatening their world that they must face together. It would be full of tension as they learn to trust each other.
One plot idea could be that Alina discovers she has a special power that can either save or doom Dracula. For example, she might be able to control his vampiric urges. Another could be that Dracula, despite being a dark prince, falls deeply in love with Alina and has to choose between his dark nature and her. Maybe there's a prophecy that links them together in some way, like they are the only ones who can stop an ancient evil from rising.
Another fanfiction could be set in a modern world where Dracula is awakened from his slumber. He is confused and disoriented by all the new technology. A young journalist discovers his existence and decides to help him adapt instead of exposing him. It could be a story about their friendship and Dracula's journey to understand the modern world.
One idea could be exploring the Dark Prince's backstory more in - depth. Maybe he had a love interest before he became the Dark Prince that could be reintroduced into his life, causing an internal struggle between his dark side and the remnants of his former self.
The reader could be a lost traveler who stumbles upon Dracula's castle during a storm. Dracula offers shelter, but the reader soon realizes that there's something not quite right. As time passes, the reader discovers Dracula's loneliness and begins to feel sympathy for him. This could lead to a friendship or more, as the reader tries to bring some light into Dracula's dark existence.
One possible plot idea could be the Dark Prince having a hidden agenda that not even Voldemort is fully aware of. He might be secretly manipulating events to gain ultimate power for himself. For example, he could be using the chaos of the wizarding war to his advantage by making deals with both sides without their knowledge.
Well, you could have a time - travel plot in the 'Danny Phantom: The Dark Prince' fanfiction. Danny travels back in time and accidentally changes something that leads to the creation of a more powerful and evil Dark Prince. Now he has to figure out how to fix the timeline while also dealing with this enhanced threat. Or perhaps a plot where the Dark Prince gains the ability to possess humans, and Danny has to find a way to stop him without harming the innocent people.
One idea could be that the OC is a vampire hunter who initially sets out to destroy Dracula but ends up falling in love with him. Their relationship could be a struggle between her duty and her new - found feelings.
One idea could be a crossover with a wizarding world. Young Dracula could end up at Hogwarts and have to deal with the magical rules there while still maintaining his vampire nature. He might make friends with some of the students who are intrigued by his vampiric abilities.
One idea could be that Dracula somehow gets involved in the world of Percy Jackson, maybe he's after a powerful artifact in Camp Half - Blood. And the demigods have to team up to stop him from getting it.
One idea could be that Dracula falls in love with a modern - day vampire hunter. At first, they are enemies, but as they get to know each other, they can't resist the attraction. Another could be Dracula falling for a human who has a special power that makes her immune to his vampire charm at first, but he is drawn to her uniqueness.