In a PLL time jump fanfiction, it could be that Spencer has become a detective. When a series of murders start happening in Rosewood again, she calls the other Liars back. They struggle to adapt to the old town and the new danger, while also dealing with their past traumas.
One idea could be a story where the heroes from different Jump universes have to team up against a new, unknown threat that is slowly corrupting their worlds. Another could be a character - driven story focusing on a minor character from one of the Jump series and their journey through the chaotic world of Jump Force.
One idea could be a crossover with a detective from another popular crime show. They could team up to solve a complex case that spans across different cities or even countries. The clash of their different investigative styles would create interesting dynamics.
A new character could be the main villain. Maybe a person who has been obsessed with the Liars' story and wants to recreate the drama and chaos for their own twisted reasons.
Perhaps they get assigned to an all - girls' school undercover. They have to dress as girls and deal with the typical high - school girl drama. Jenko is especially out of his element, but Schmidt uses his charm to get in with the popular clique. As they dig deeper, they find out that there's a cheating scandal involving some of the teachers, and they have to expose it without blowing their cover.
One idea could be a story where the heroes from different Jump universes are forced to team up against a new, unseen threat that can manipulate the very fabric of their worlds. For example, a villain who can erase characters' powers or change their personalities.
One idea could be exploring the backstories of the characters more in - depth. For example, delving into what made the main characters choose the path they're on in Jump Street. Another could be a time - travel twist where the characters go back to an earlier case and have to solve it with their current knowledge.
A plot could revolve around a personal conflict between Hanson and Hoffs. In 21 Jump Street, they are partners but start to have differences in how they approach cases. One is more by - the - book and the other is more of a risk - taker. This causes tension in their partnership, but when they are faced with a particularly dangerous case involving a serial killer targeting young people, they have to put their differences aside and work together to solve the case.
Perhaps there's a fanfiction where Tom and Doug swap personalities for a day due to some strange occurrence. This would lead to hilarious situations as they try to act like each other while on the job. Doug, trying to be more like Tom, would be overly cautious, and Tom, trying to be like Doug, would be a bit too reckless. Eventually, they learn to appreciate each other's normal ways even more.
One idea could be that the characters from TVD end up in the PLL world due to a magical mishap. For example, Damon and Stefan could find themselves in Rosewood and get involved in the mystery of 'A'. They might use their vampire skills to protect the PLL girls from the unknown threats.
Maybe a story where two characters from different time periods in the 'heartlands of time' meet accidentally. They then have to work together to solve a problem that is affecting both of their respective times. It could involve a power struggle over a time - based resource that is crucial for the stability of the 'heartlands of time'.