An interesting inside out oc fanfiction could focus on an OC who is a 'Memory Keeper'. This character's job is to make sure that important memories don't fade away. The OC could have conflicts with the other emotions, especially Sadness, who sometimes makes memories seem less appealing. But in the end, they all realize that each has an important part to play in Riley's mental world.
One idea could be creating an OC who is a new emotion in Riley's mind. For example, an emotion of 'Wonder' that gets activated whenever Riley experiences something truly amazing. This OC could interact with the existing emotions, like Joy being both excited and a bit jealous of this new emotion's unique role.
A possible plot is that the control panel in Riley's mind gets a malfunction, and the emotions have to work together in a completely new way. They might have to swap their usual functions, so Sadness has to take on the role of Joy for a while. This could lead to some really strange behaviors from Riley on the outside. Also, what if an outside force, like a dream character, tries to invade the inside world of Riley's emotions and disrupt their harmony?
One interesting concept could be exploring different emotions for the characters other than the main ones shown in the movie. For example, what if there was a secondary emotion that was a mix of sadness and joy that Riley had to deal with.
One idea could be a story where Joy and Disgust have to team up to help Riley through a new and strange situation. Maybe Riley has to eat a very unusual food for a school project. Disgust is initially against it, but Joy tries to find the positive side and together they encourage Riley to give it a try, leading to a new experience for her.
Well, in 'naruto inside out fanfiction', we could see unique interpretations of the characters' memories. For example, Sasuke's memories of his family and the Uchiha clan's downfall could be explored in a new light, showing how these memories shape his actions and emotions. Also, the concept of different 'islands' in the mind, like an 'island of jutsu training' for Naruto, could be really fascinating.
A great plot for an Inside Out Anger x Disgust fanfiction is when Riley starts to experience a new type of emotion that is a mix of both anger and disgust, and Anger and Disgust have to work together to understand and manage it. They could start off at odds, with Anger thinking it's more of his domain and Disgust disagreeing. But as they explore this new emotion further, they learn to respect each other's perspectives. Also, a plot where they get trapped in a part of Riley's mind that is filled with memories that make both of them uncomfortable could be interesting.
A great plot idea could be the emotions trying to deal with Riley's new hobby. For example, if she decides to take up painting, the emotions might have different reactions. Joy would be excited and try to make the most of it, while Fear might be worried about Riley not being good at it and getting disappointed. This can lead to a lot of comical and heartwarming interactions among the emotions without any sexual elements.
There could be a fanfic that focuses on the backstories of the new emotions introduced in 'Inside Out 2'. It could go into detail about their creation and how they fit into Riley's emotional world. Maybe one of the new emotions has a special connection to a memory that was previously unexplored in Riley's mind.
Another idea is that there is a new emotion that enters Riley's mind and it seems to be a threat to both Joy and Sadness. They have to team up to figure out what this new emotion is and how to deal with it. Along the way, they discover new sides of each other and strengthen their bond.
One idea could be creating an OC who has a unique power related to time manipulation. They could be from a different dimension and end up in the Avengers' world. Another idea is an OC who is a master of ancient magic and teams up with Doctor Strange within the Avengers group. Maybe an OC that is a super - intelligent android created by a villain but has a change of heart and joins the Avengers.
You could create an OC for your Persona OC fanfiction who is an artist. This artist OC could use their art as a way to understand and even manipulate the Metaverse. For example, they might draw scenes from the Metaverse that give clues about upcoming events or hidden locations. Their art could also be a form of therapy for other characters who are struggling with their dual lives in the real world and the Metaverse.