You could write a Ghost Hunt fanfic that delves into the relationship between Lin and Naru. Maybe explore what would happen if Lin had to make a choice between following Naru's orders and protecting Mai when they are in a dangerous situation. Another idea is a fanfic that takes place in a parallel universe where the roles of the characters are reversed, like Mai being the one with all the knowledge and the guys being the ones with the psychic abilities.
One idea could be a fanfic where the team discovers a new type of ghost that has the ability to manipulate time. Another could be a story that focuses on the backstory of one of the minor characters in the Ghost Hunt series. For example, a fanfic about how Mai got her first psychic experience as a child.
A possible plot for a Harry Potter Ghost Hunt fanfiction is that a group of students start seeing strange apparitions that seem to be leading them to a hidden chamber in Hogwarts. As they follow these ghostly figures, they realize that it's a test set by one of the founders of Hogwarts. If they succeed in the hunt and reach the chamber, they will be rewarded with a powerful magical artifact. Maybe it could be a wand that has the ability to control certain types of magic better than any other wand. Or perhaps a cloak that not only makes the wearer invisible but also provides protection from dark magic spells.
For the crossover, a good plot could be that a new type of ghost appears that is immune to Danny's ghostly powers. The Ghost Hunt team, which has encountered a similar situation before, offers their expertise. They introduce Danny to a special type of ectoplasm - based weapon that can harm this new ghost. Danny then teaches them some of his combat moves as a half - ghost to better fight the ghost.
One idea could be Percy being reluctantly recruited by the Hunt. He has to learn their ways while still holding onto his own identity. Maybe he discovers a new power related to the Hunt that no one expected.
The unique take on the Ghost Hunt universe. 'A Shattered Soul Ghost Hunt Fanfic' can introduce new ideas and concepts that the original might not have explored fully. For instance, it could explore different cultural beliefs about ghosts and how they interact with the existing Ghost Hunt framework. This adds a whole new layer of depth and intrigue to the story.
One idea could be a crossover with Blade Runner. The cyberpunk settings of both are similar. The main character from Ghost in the Shell could be on a mission in the world of Blade Runner, exploring the differences and similarities in the way humans and replicants interact with technology compared to how Section 9 deals with cybernetic enhancements. It would be fascinating to see how the concepts of identity and consciousness play out in this merged world.
One idea could be exploring the backstory of the 'Ghost of You' more in - depth. Maybe it was a lost love who died tragically, and the fanfic could focus on the main character's journey to find out the truth behind their death. Another plot could be about the 'Ghost of You' trying to communicate a hidden message to the living world through the main character.
One idea could be a crossover with Doctor Strange. Ghost Rider's hellish powers could clash or collaborate with Strange's magic in the fight against some interdimensional threats. For example, they might have to deal with demons that are breaking through from different realms.
You could also do a fanfic about Jin's time in exile. What if he encounters a group of bandits who are actually descendants of an ancient Japanese clan that was wronged in the past? They initially see Jin as an enemy but as he proves his worth and his cause, they end up helping him. This would involve Jin learning about a part of Tsushima's history he was previously unaware of, and he could use this new - found knowledge to his advantage when he finally returns to face the Mongols.
Well, one idea could be that Naruto is on a hunt for a powerful and elusive enemy. Maybe this enemy has some unique abilities that Naruto has to figure out how to counter. Another could be that he's hunting for a rare item that's crucial for saving the village or someone he cares about.
One idea could be Percy joining the hunt temporarily. Maybe there's a prophecy that requires his unique skills and the hunt needs his help to complete a mission. For example, a powerful monster is on the loose that only Percy can track down because of his connection to the sea. Another could be a love triangle between Percy, a huntress, and someone from Camp Half - Blood.