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.
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.
One idea could be Molly and the ghost having to team up to save their town from a mischievous spirit. They could use Molly's positive energy and the ghost's spooky powers to defeat it.
One idea could be that Casper befriends a lonely alien who has crash - landed on Earth. They team up to find a way to repair the alien's ship while also having adventures in the human world and teaching each other about their different cultures.
One idea could be that a group of students form an unofficial ghost hunting club at Hogwarts. They start investigating the Grey Lady's past more deeply and end up uncovering a long - forgotten secret about her and a hidden treasure in Ravenclaw Tower. Another could be that they suspect the Bloody Baron is not as menacing as he seems and is actually protecting the school from a more malevolent spirit that no one else is aware of.
One idea could be to cross it with a cyberpunk world. The Ghost Recon team has to navigate a high - tech, dystopian city filled with neon lights and hackers. They could be after a rogue AI that has ties to a powerful criminal syndicate. Another idea is a crossover with a post - apocalyptic setting. The soldiers find themselves in a world ravaged by war and must use their skills to survive and protect the remaining survivors from raiders.
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.
One plot idea could be that the Ghost Phoenix is a guardian spirit of an ancient artifact in the Lost Girl universe. The main character discovers its existence and has to figure out how to communicate with it to unlock the secrets of the artifact.
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.
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 backstories of the minor characters in Ghost Wars. For example, the local villagers who are caught in the middle of the war. Another could be a what - if scenario, like what if a different character had found the key piece of evidence first. And a third idea is to focus on a love story between two characters from opposing sides in the Ghost Wars.