There's a fanfic where the ghost zone from Danny Phantom and the afterlife in Harry Potter are somehow connected. Danny and Harry have to journey through this strange merged realm to stop an evil force that is using the connection to gain power. It's a really unique idea as it combines the different concepts of the afterlife from both universes and creates a whole new adventure.
One creative plot is when Danny's ghostly powers are mistaken for a new type of magic in the Harry Potter universe. For example, in a fanfic, the Ministry of Magic tries to study Danny because they think he could be a powerful new magical being. This leads to all sorts of chaos as Danny just wants to go home and Harry tries to help him.
One great 'Danny Phantom' and 'Harry Potter' fanfic is 'The Phantom in Hogwarts'. It combines the unique ghost - fighting elements of Danny Phantom with the magical world of Harry Potter in an interesting way. The story follows Danny as he somehow gets transported to Hogwarts and has to deal with both the magical threats there and his own ghostly powers.
A cool plot could be that Danny overshadows Sam to enter a place only humans can go. Sam has some special access to a top - secret facility, and Danny needs to get in to stop a ghost - human conspiracy. He uses Sam's form to sneak in and gather evidence.
Another great pairing would be Danny and Hermione. Hermione's thirst for knowledge would be piqued by Danny's unique powers. She would probably want to study Danny and his ghostly nature, trying to find a scientific or magical explanation for it. Danny, in turn, could be amazed by Hermione's intelligence and her vast knowledge of magic. They could work together on some kind of project, perhaps finding a way to combine ghost powers and magic for a greater good.
The fanfiction where Danny's class goes on a field trip to a floating island in the sky that's full of ancient ghostly artifacts is quite creative. The author creates a whole new world up there with its own rules and mysteries. Also, there's a story where the field trip is to a place that can make people's worst nightmares come true. Danny has to use his ghost powers in new and unexpected ways to protect his classmates. It's very creative in how it plays with fear and the power of the mind.
There's this fanfiction titled 'The Phantom Teacher'. It's quite creative as it has Danny having to take over Mr. Lancer's class for a day when Lancer is out sick, but of course, things go haywire because of Danny's double life as a ghost - fighter. The story combines elements of school - day chaos with Danny's ghostly abilities in a really engaging way.
There's a fanfiction where the Hogwarts houses are reimagined as different species from 'Ben 10'. So, Gryffindor might be like the Pyronites (the fire - based aliens in 'Ben 10'), known for their courage. Slytherin could be related to the Ectonurites (the ghost - like aliens), representing their sly nature. This reimagining creates a whole new dynamic within the Hogwarts world and also allows for some interesting interactions between the 'Ben 10' and 'Harry Potter' elements.
One popular theme is the clash of cultures. The modern - day, American - based Danny Phantom world meeting the traditional, British wizarding world of Harry Potter. Another is the power exchange, like wizards trying to understand and maybe even use Danny's ghost powers. And of course, friendship between the characters from both universes is a big theme.
The fanfic could delve into their family history. Maybe there was a long - lost connection between their families that led to them being brothers. It could explore how this discovery affects their identities. Danny, who has always been a bit of an outcast in his own world, might find a new sense of belonging with Harry. And Harry, who has lost so many family members, could gain a new brother. There could be a lot of emotional moments as they navigate this new relationship while also dealing with the threats in their two worlds.
A creative plot is when a character travels back to stop Voldemort from ever being born. This completely changes the whole dynamic of the wizarding world. It's different from the original story and allows for a whole new exploration of the characters and their relationships without the main threat of Voldemort.
One interesting element is the cultural exchange between the two universes. Danny comes from a more modern, technological world, while Hogwarts is steeped in magic and tradition. Seeing how the characters from each side react to the other's world is really engaging. Also, the potential for new character relationships. Like Danny and Hermione becoming friends and sharing their knowledge. Or Danny using his powers to help Harry in a Quidditch match in a really unexpected way. It's all about the creative combinations that fanfiction writers come up with.