Perhaps the creator of such fanfiction was interested in exploring the contrast between good (as represented in Harry Potter) and evil (as Belphegor is often seen in some interpretations). They might want to see how the characters and world of Harry Potter would react if there was an intrusion of a figure like Belphegor. It could also be just a wild creative idea from a fan who loves both Harry Potter and stories related to Belphegor and just wanted to mash them together to see what would happen.
Luna Lovegood might have a unique connection with Belphegor. She often has an open - minded view of strange creatures. She could see past his menacing exterior and try to communicate with him on a different level. Harry and his friends might be initially skeptical of her approach but later realize that her way was the key to dealing with Belphegor, either befriending him or getting rid of him.
Well, it's a rather strange combination. In the vast world of fanfiction, there are all kinds of crossovers. However, this one might not be as mainstream. Harry Potter has its own huge fanfiction universe with many typical crossovers like with other fantasy series or historical settings. But a connection with Belphegor is quite out of the ordinary. It might be a very niche area within the fanfiction world, created by a small group of fans who have a particular interest in both Harry Potter and the concept related to Belphegor.
A plot could involve Belphegor disguising himself as a new teacher at Hogwarts. He starts to influence the students in a negative way, spreading laziness and chaos. Harry Potter senses something is wrong and with the help of Hermione's research and Ron's loyalty, they discover the true identity of the 'teacher' and try to stop his evil plans.
In 'Persona 4 Visual Novel', the gay persona might represent the diversity of the game's character creation and the exploration of different sexual orientations within the game's fictional world. It could add more depth to the relationships and storylines.
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.
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.
Yes. Persona 5 Royal adds new content that enriches the story. It has new characters and story arcs that blend well with the original plot. For example, the new character Kasumi brings a fresh perspective and her own story line that ties into the overall narrative in an interesting way.
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.