A possible plotline is the emergence of new Personas during the time skip. The characters might have to learn how to control and utilize these new powers. There could also be a mystery surrounding the origin of these new Personas, which they need to solve in order to fully understand their new abilities and how they fit into the overall battle against evil.
Perhaps a plotline where the main character has lost some of their memories during the time skip. This would lead to a journey of self - discovery as they try to piece together their past while also facing new threats in the present. They might encounter old friends who have changed and have to re - establish their connections.
The main characters are likely to be the ones from the original Persona 5 game. So, there's Joker, the protagonist. Then there's Ryuji, who is his brash and loyal friend. Morgana, the mysterious cat - like being, also plays a significant role. And of course, Ann, the beautiful and kind - hearted model - in - training.
One interesting plotline could be Makoto and Akira teaming up to take on a powerful shadow that the Phantom Thieves initially underestimated. They might have to use their combined Personas in a unique way to defeat it.
Another plot could be that Minako and Ken are both part of a special mission in the Persona realm. They have to rely on each other's unique skills. Minako's combat skills and Ken's strategic thinking combine to make them a formidable team. Along the way, they share their fears and hopes, and a special connection begins to form between them.
In some izuku time skip fanfiction, Izuku could have developed his own unique fighting style during the time skip. For example, he combines his original combat training with the various quirks of One For All in unexpected ways. This makes him a more formidable hero, and his battles are not just about brute strength but also about strategic use of his abilities.
Some time skip stories revolve around characters who gain or lose powers during the time skip. For instance, a young wizard is banished to an isolated island for a decade. During that time, he delves deep into his magic studies. When he returns to the mainland, he has powers far beyond what anyone expected. On the other hand, there could be a story where a superhero loses his powers during a time skip due to some scientific experiment gone wrong. He then has to find a new way to be a hero in a world that still expects him to save the day.
One idea could be Luffy learning new and extremely powerful Haki techniques during the time skip that no one has ever seen before. This would make him even more of a force to be reckoned with when he returns to his crew.
Well, a cool concept in Naruto time skip ability fanfiction is the enhancement of existing abilities. Like Sakura could have mastered a new level of her strength - perhaps she can now use her medical ninjutsu to heal on a much larger scale or even bring people back from the brink of death more easily. And then there's the idea of new alliances. Characters who were once enemies might form unexpected alliances during the time skip, which could lead to all sorts of new storylines. For instance, some of the minor villainous clans could team up with the Leaf Village for a common goal.
Perhaps they travel forward in time instead. They could see the consequences of their actions in the future. Maybe they find out that their actions had unintended negative effects on some of their friends or the city as a whole. This would lead them to go back and try to fix things in a different way.
Perhaps the person who initiates the time travel isn't who they seem. It could be an imposter who has their own motives for changing the past, like a Shadow in disguise. This would add a whole new layer of mystery and danger to the story.
One idea could be the characters from Persona 4 and Persona 5 swapping their worlds. So the Phantom Thieves end up in Inaba and have to deal with the Midnight Channel mystery. And the Investigation Team finds themselves in Tokyo and gets involved in the Metaverse. It would be really cool to see how they interact with the different environments and characters.