You could also base the plot on a prophecy or an ancient legend within the Persona 3 world. Suppose there's a prophecy that says an OC with a certain power and Yukari must join forces to save the world. This gives a grand scope to the story. Along the way, they face various challenges and obstacles that test their friendship and their abilities.
First, understand the characters well. For your OC (Original Character), give them a unique backstory, personality traits, and goals. When it comes to Yukari, study her in - game personality. She's often strong - willed and a bit mysterious. In the fanfiction, you can start with an interesting encounter between your OC and Yukari. Maybe they meet during a mission in Tartarus. This initial meeting can set the tone for the whole story.
One possible scenario in this fanfic could be Yukari and Mizukage teaming up for a difficult mission in the Persona 3 world. They might start off as reluctant partners, but as they face challenges together, they begin to understand and respect each other more. For example, they could be exploring Tartarus and encounter a powerful shadow that they have to combine their Personas' powers to defeat.
Their interaction is significant as it adds depth to the story. It shows how different personalities can come together. For example, Yuki's calmness can balance Yukari's sometimes impulsive nature. This makes for a more engaging read.
Yuki and Yukari in Persona 3 fanfiction usually have a relationship that is both platonic and full of mutual respect. Yuki might be seen as a stabilizing force for Yukari, while Yukari can bring out the more social side of Yuki. Their interactions can range from light - hearted conversations to serious discussions about their roles in the fight against the Shadows. This relationship is a key part of what makes the fanfiction interesting as it shows different aspects of their characters through their connection.
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.
It might not be as widely known as some of the main plotlines in Persona 3. There are so many aspects to the game and different fan - created content that some stories can get a bit lost. However, among die - hard fans who are into the more niche and spooky parts of the game's lore, it could be relatively well - known.
One common theme is growth. Both Makoto and Yukari grow as characters through their relationship. Another theme is loyalty. They are often shown to be loyal to each other in different situations. And of course, there's the theme of friendship which can sometimes turn into something more in these fanfictions.
There might be different versions of this 'persona 3 yukari ghost story'. It could potentially be related to the Tartarus in Persona 3. Since Tartarus is a spooky place filled with Shadows. Yukari might have had an experience where she thought she saw a ghost - like apparition while exploring Tartarus. Or perhaps it's a story about a haunted location in the game world that Yukari visits and strange things start to happen to her.
You can try fanfiction websites like Archive of Our Own (AO3). It has a large collection of fan - created works, and you're likely to find some great 'persona 3 mitsuru x yukari fanfiction' there. Just use the search function to look for it specifically.