A crossover with 'Scooby - Doo' could also be really cool. In this fanfiction, the gang and Danny could be investigating a haunted mansion that actually has real ghosts. Danny's knowledge of the ghost world would help the Scooby - Doo gang solve the mystery in a different way than they're used to. His ability to fight ghosts directly would add a new dynamic to their usual mystery - solving routine.
One popular Danny Phantom slash fanfiction could be those that focus on the relationship between Danny and his ghostly enemies in a new, unexpected way. For example, some might explore a friendship - turned - more - than - friends scenario between Danny and Dash. It adds a new layer of character development and unique plotlines.
One interesting story could be about Danny and Sam going on a ghost - hunting adventure together. They might discover a new type of ghost that has unique powers and they have to figure out how to defeat it using their combined skills.
One idea could be a crossover where the magical world of Harry Potter intersects with the ghostly realm of Danny Phantom. Maybe Danny gets accidentally transported to Hogwarts and has to navigate the strange new world of magic while also dealing with his own ghost powers. He could form an unlikely friendship with Harry Potter and together they face a new threat that combines elements from both their universes.
One idea could be Danny Phantom teaming up with characters from other Nickelodeon shows to fight a common supernatural threat. For example, he could join forces with the Teenage Mutant Ninja Turtles. They could use their unique skills, Danny with his ghost powers and the Turtles with their ninja skills, to take on a powerful ghost - mutant hybrid enemy.
One idea could be to explore how Danny's ghost powers interact with the dark and tortured world of 'The Suffering'. Maybe he gets trapped in that nightmarish realm and has to use his unique abilities to survive and find a way out. Another idea is to have some of the tortured souls from 'The Suffering' cross over into Danny's world and how he deals with them while keeping his identity as a half - ghost a secret.
One idea could be that Danny's ghost powers somehow interact with the dragons in HTTYD. For example, his intangibility might make him able to pass through dragon fire without getting burned, and this could be a crucial skill when dealing with a new, more dangerous breed of dragons. Another idea is that Danny gets transported to the world of HTTYD and has to use his ghostly abilities to fit in and help the Vikings. Maybe he can use his flight ability to race against the dragons, which would be an exciting plot point.
Well, in some 'Danny Phantom Betrayed' crossovers, Danny might be betrayed by a love interest. For example, if it's a crossover with another show and he falls for a character from that show, but that character betrays him for their own gain or because of some hidden agenda. It could lead to Danny having to reevaluate his trust in people and also face new challenges that come with the heartbreak and the betrayal. Also, he could be betrayed by an authority figure in a crossover universe, like a powerful wizard or a superhero leader who turns out to have ulterior motives.
One interesting Danny and Dani fanfiction could be about them teaming up to fight a new and powerful ghost. They use their combined powers and unique abilities to outwit the enemy. For example, Dani might use her speed while Danny uses his more powerful ghost ray.
You can start by searching on popular fanfiction websites like Fanfiction.net or Archive of Our Own. Use specific search terms like 'Danny Phantom crossover' along with the name of the other fandom you're interested in. For example, if you want a crossover with 'Avatar: The Last Airbender', search for 'Danny Phantom Avatar crossover'.
Another type of interesting fanfiction in the Danny Phantom universe might be those that delve into his relationships. It could be his friendship with Sam and Tucker taken to new levels. Maybe they go on an adventure together that tests their friendship in ways not seen in the original series. For instance, they might have to make a difficult choice between saving Danny's secret identity or saving the town from a new ghost threat.