First, research the existing lore of Hotel Transylvania. Know the rules about vampires, how they interact with other monsters, and the overall tone of the movie. Then, develop Jonathan's character as a vampire. Think about how his human qualities will mix with his new vampiric nature. For example, will he still be as clumsy or will he become more suave? Next, create a plot. It could be a simple adventure where he has to prove himself to the vampire community or a more complex story about identity.
One idea could be that Jonathan discovers a hidden vampire power within himself. Maybe he starts to have visions of ancient vampire battles and uses this knowledge to help Dracula and his friends in a new crisis at the hotel. For example, he could foresee an attack from a group of vampire hunters and use his unique human - vampire hybrid perspective to come up with a clever defense strategy.
Johnny becoming a vampire in the Hotel Transylvania universe could lead to some really interesting scenarios. For example, he might struggle with adapting to vampire life while still maintaining his human charm. He could have a hard time getting used to the nocturnal lifestyle and the need to drink blood, which would be a big change from his regular human habits.
One possible plot could be that Johnny is accidentally turned into a vampire. He then has to deal with the shock of his new state while also trying not to worry his human family. He could rely on Mavis and Dracula for support and guidance in learning about his new powers and limitations.
Mavis, Dracula's daughter, could befriend Naruto. She has a kind heart and is always open to new things. She could introduce Naruto to all the different monsters in the hotel. Naruto could then share his stories of his village, Konoha, with her. They could also go on an adventure together in the hotel, like exploring a hidden part of the hotel that has some kind of magic item that Naruto needs to complete his mission (if he has one in the fanfiction) or that Mavis wants to protect.
The more powerful characters like Naruto and Dracula could have a more complex relationship. Dracula has his own set of rules and values in his hotel world. Naruto, with his strong sense of justice, might not always agree with Dracula's ways. However, they could also find common ground in protecting their respective worlds. Maybe there's a greater threat that forces them to work together, and during that time, they learn to respect each other's differences and powers.
Well, Hermione could use her vast knowledge of magic to help solve some of the problems in Hotel Transylvania. For instance, if there was a magical malfunction in the hotel's systems, she could probably figure out a spell to fix it.
The characters from Hotel Transylvania could be new students at Hogwarts. Dracula could be a teacher of some sort, perhaps teaching about dark creatures in a different way than Hagrid. His bat form could be mistaken for a dark omen by some students at first.
There is no real - life story behind 'Hotel Transylvania'. It's a fantasy world filled with all kinds of monsters. The filmmakers used their creativity to design the hotel, the characters, and the story. For example, Dracula running a hotel for monsters where they can be safe from humans is a completely fictional idea. It's a great example of how animation can create an entirely new and exciting world out of thin air.