One unexpected situation could be Danny revealing his identity to the whole town not by accident but on purpose to gain their trust in a time of great danger. For example, a powerful ghost is threatening to destroy the town and Danny thinks that if the people know who he is, they can work together better to fight the threat.
In some fanfiction, an unexpected situation might be that Danny's powers change completely. Instead of his normal ghost powers, he could gain the ability to control time. This would throw off his usual methods of fighting ghosts and dealing with his double life, leading to all sorts of new adventures and challenges.
They can also introduce new plot twists. Say Danny finds out he has a long - lost sibling who is also a half - ghost. This completely changes the family dynamic and the story's direction. It allows for exploring new relationships and character growth that might not have been possible without this unexpected situation.
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 aspect that could make it unique is the way it blends different genres. Perhaps it combines horror elements from the Danny Phantom universe with some comical situations in an unexpected way. Also, the fanfiction might introduce new settings or backstories for the characters that are not in the original, making it stand out.
They can also introduce new themes. Say, an unexpected time - travel event occurs in the fanfiction. Danny could end up in the past or future of the Danny Phantom world. This would allow the exploration of different eras of the story's setting, different versions of characters, and how Danny's actions in this new time affect the overall timeline.
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.
One idea could be exploring Danny's relationships in a different way. For example, how his friendship with Sam and Tucker might develop if they faced a new supernatural threat. Another could be a story where Danny discovers a new power and has to learn to control it while dealing with school and his ghost - fighting duties. And perhaps a fanfiction where Danny travels to an alternate dimension within the Danny Phantom universe.
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.
Well, first of all, look for dedicated Danny Phantom fanfiction archives. These are often filled with a wide variety of fanfictions, and you can use their search functions to look for ones with the 'unexpected CI' aspect. Another option is to join Danny Phantom - related forums. There, you can ask other fans if they know of any such fanfictions. They might be able to point you in the right direction, perhaps to some hidden gems that are not as well - known on the larger fanfiction platforms.
One interesting storyline could be Paulina finally realizing Danny Phantom and Danny Fenton are the same person. She could initially be shocked but then come to accept it and they team up to fight a new powerful ghost. It would add a whole new dynamic to their relationship.