One interesting crossover could be the Phantom Thieves entering the world of No Game No Life. They might use their Personas to compete in the various games in that world. For example, Joker's Arsene could give him an edge in a high - stakes card game.
But we also can't forget about Arsene, Joker's initial Persona. Arsene has some powerful abilities on his own. In the combined fanfiction world, he could potentially possess some unique qualities from the No Game No Life world as well. Maybe he could gain the ability to manipulate the rules of games like the characters in No Game No Life do, making him an extremely formidable force.
One possible aspect to analyze in Persona 4 Yu x Naoto fanfiction is their character development within these stories. Yu is often portrayed as a strong and empathetic protagonist, and his relationship with Naoto can bring out different sides of both characters. For example, Yu might help Naoto to be more open about her true self, as Naoto initially hides behind her detective persona.
The architecture in Persona 5 is also very distinct. Your male OC could have a special connection to a particular location in the game, like Leblanc coffee shop. Maybe he works part - time there and has some interesting conversations with Sojiro. This would help to ground him in the game's environment.
In these fanfictions, the relationship between Makoto and Yukari can be seen as a source of character development for both. Makoto might influence Yukari to be more confident, while Yukari could bring out a softer side of Makoto. It's also common to see their relationship explored in the context of the overall plot of Persona 3, like how they deal with the Shadows together and how that affects their feelings for each other.
How about 'Persona 4 OC's Adventure with Naoto: A Fanfiction Tale'? This title not only indicates the main characters which are the OC from Persona 4 and Naoto but also implies that there will be an adventure involved. It gives a sense of excitement and mystery which might attract readers to check out the fanfiction.
Well, start with a concept. Maybe your oc has a special ability that draws Ann's attention. Then, build their relationship gradually. Don't rush into making them fall in love right away. For the setting, use the locations from Persona 5 such as Shujin Academy. When writing the dialogue, make sure it sounds natural for both characters. Ann has a certain way of speaking, so your oc's dialogue should also match the tone of the story. Also, add some action scenes from the game, like battles with Shadows, to make it more exciting.
Another popular theme is their teamwork. Given their different skillsets - Yu with his multiple Personas and Naoto with her detective skills - they can be a formidable duo in fanfiction. They might go on secret missions or solve difficult cases together, which not only strengthens their bond but also showcases their individual strengths.