The story of Persona 3 mainly revolves around the Dark Hour. A group of students discover their ability to summon Personas. They form a team to fight against the Shadows that emerge during this special time. They face various challenges and mysteries throughout their journey.
The main plot of Persona 5 story is about a group of high school students who form the Phantom Thieves. They enter the Metaverse, a cognitive world, to steal the distorted desires of corrupt adults. These adults are often causing harm in the real world through their warped mindsets. The Phantom Thieves aim to reform society by changing the hearts of these evildoers.
Perhaps the fanfiction focuses on the cultural clash between the two groups. The Persona 4 characters are from a small town, while the Persona 5 crew is from the big city. Their different ways of handling things and their unique Personas could lead to some interesting interactions. For example, Yu and Joker might have different leadership styles that they have to reconcile in order to succeed against the shadows.
It's about a group of high school students who discover a mysterious world inside the TV. They enter this world to solve a series of strange murders in their town. Each character has their own unique Persona which they use to fight against the Shadows in the TV world.
A great plot could be that a new threat emerges that has the power to erase the memories of people in both Persona 4 and Persona 5's worlds. The characters from both games must work together to find the source of this threat. The Phantom Thieves could use their infiltration skills, while the Investigation Team could use their detective - like skills to gather clues. As they progress, they discover that the root of the problem lies in an ancient evil that was once sealed away but has now been awakened due to some modern - day events.
Maybe the Velvet Room attendants from both games somehow get their worlds mixed up. Igor from Persona 5 and Margaret from Persona 4 have to work together to set things right. This leads to the characters from both games interacting. The Phantom Thieves might learn some new combat techniques from the Investigation Team and vice versa. They could then use these new skills to face a common threat that emerges from the merging of their two realities.
Maybe there's a strange distortion that merges parts of Inaba and Tokyo. The characters from both Persona 4 and Persona 5 find themselves in this strange new place. They start to notice that the Shadows in this merged world are more powerful and have new abilities. The Investigation Team and the Phantom Thieves must figure out how to adapt their Personas and strategies to fight these new threats while also dealing with the cultural differences between their two groups.
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.
I'm not entirely sure as I haven't fully delved into it. But generally, it might combine the elements of Granblue Fantasy and Persona 5. It could involve characters from both universes embarking on an adventure, perhaps facing some common enemies or trying to achieve a shared goal.
The 'persona 4 light novel' generally follows the story of the main characters in the Persona 4 universe. It likely involves their adventures in the strange world within the TV, fighting Shadows, and uncovering the mysteries behind the disappearances. It also delves into the character development of the group, like how they come to terms with their Personas and grow as individuals.
The main plot involves the characters from Persona 4 getting involved in a fighting tournament. But there are deeper mysteries and dark forces at play that connect to the Persona universe's lore.