Some fanfictions might focus on the origin of Danny's obsession with the Demigheist. Maybe it started from a chance encounter where Danny saw the Demigheist's unique powers and was intrigued. In these stories, the author could delve deep into Danny's psyche, showing how this obsession grows over time and how it affects his relationships with his friends and family.
Next, plan out your plot. You could start with a simple premise like Danny noticing the Demigheist for the first time and then becoming fixated. Build on that by adding in conflicts. Maybe Danny's friends don't understand his newfound obsession and try to pull him away from it. Also, make sure to give your story an arc, like Danny learning something important about himself through this obsession.
A common theme is the power struggle. Danny has his ghost powers and the Demigheist has its own unique abilities, and often there's a struggle for dominance or cooperation regarding these powers. Another theme is identity. Danny is a half - ghost and the Demigheist is something different yet related to the supernatural world, and both characters are often exploring who they are in relation to each other.
One great Danny Phantom Demigheist fanfiction is 'The Demigheist's Secret'. It delves deep into the unique relationship between Danny and the Demigheist, with a lot of mystery and action. Another is 'Demigheist Encounters', which focuses on how Danny's ghost powers interact with the Demigheist's abilities in some really interesting ways.
One example could be Danny suddenly losing his powers in a fanfiction. This would completely change the dynamic of his battles and how he interacts with the ghosts. It's an unexpected turn that can lead to new storylines like him having to rely on his friends and human skills more.
One great one to start with could be 'The Ghostly Guardian'. It really delves into Danny's growth as a hero. Another good option is 'Phantom's New Beginnings' which gives an interesting take on his relationships. And 'Danny's Secret Allies' is also quite engaging as it introduces some new and unique characters.
One great Danny Phantom and Danielle Phantom fanfiction is 'The Twin's Adventure'. It explores their relationship in a new ghost - fighting scenario. Another is 'Danielle's Discovery' which delves into Danielle finding out more about her powers and her connection to Danny.
In some fanfictions, Danny could be abused by the ghosts he fights. For instance, a powerful ghost might constantly taunt him about his weaknesses and failures, which wears down his mental state over time and results in depression. He then has to find ways to overcome both the external threats and his internal emotional turmoil.
One great 'Danny Phantom' fanfiction to watch could be 'Phantom's Lament'. It delves deep into Danny's inner struggles in a very engaging way. Another is 'Danny in the Dark Realm', which takes the story to a whole new and exciting setting. And 'Fenton Family Secrets Unveiled' is also a popular one that reveals some interesting family backstories.
One idea could be that Danny gets an illness that affects his ghost powers. For example, he might start losing control over his intangibility or invisibility. This could lead to some really comical or dangerous situations. Another idea is that his friends try to find a cure for his strange ghost - related illness while also keeping it a secret from the town.
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.