Maybe a plot where they have to deal with outside threats to their marriage. Some jealous rivals or old enemies might try to drive a wedge between them. They would then have to work together to overcome these threats and prove their love for each other is stronger than any outside influence.
One interesting plot could be them building a life together after marriage. They might face challenges like how to combine their different combat styles into a training regime for the next generation. For example, Jaune's more unorthodox approach and Pyrrha's highly skilled and precise style could be passed on in new and unique ways.
Jaune, who has his own journey of self - discovery and growth. He brings his unique charm and sense of humor to the relationship. Pyrrha, on the other hand, with her stoic yet loving nature, is a central figure. Their relationship forms the core of the fanfiction.
Another idea is that they travel to a time before they ever met. This allows them to see how things were without their influence. Maybe they find out that small changes in the past have a huge impact on the future. For example, if Pyrrha hadn't been so well - known before coming to Beacon, how would that change the relationships and events there? And Jaune could see how different his life would have been without Pyrrha's initial guidance and friendship.
One interesting jaune married fanfiction could be one where he marries a character from his own universe and they face challenges together. For example, if he marries Pyrrha, they might have to deal with the political implications of their union in the context of the story's world.
Another plot could involve the baby having some special abilities or a unique origin. This could lead to Jaune having to protect the baby from those who might want to use it for their own purposes. For example, there could be villains who are after the baby because of its power.
One possible plotline could be them facing challenges together as a married couple in the world of Remnant. For example, they might have to deal with threats to their new family while also juggling their responsibilities as Huntsmen. Another could be a more comical plot where they struggle to adjust to living with each other's quirks. Maybe Jaune is super messy and Ruby is a neat freak, and they have to find a way to coexist happily.
Maybe they travel to a time long before the events of the story, during a period when the kingdoms were first being established. They get involved in the ancient politics and power struggles, and in the process, they discover secrets about the origin of the Grimm and the power of the Relics that were long forgotten. Their actions in this past time could have a huge impact on their present world.
Another plot could be that the OC is an outcast too, for different reasons. When Jaune is expelled, they find common ground. They could then decide to leave the place together and start their own journey. Along the way, they learn more about each other's pasts and develop a strong bond while also trying to find a way to prove Jaune's innocence in the events that got him expelled.
For Jaune, he might become more confident and assertive as he takes on the role of a husband. He could also develop new combat skills as he protects Neo. Neo, on the other hand, might start to open up more and show her softer side. Maybe she becomes more trusting of others.
It's hard to say for sure. Maybe he's off on some other mission or got lost in the chaos of the story.
A plot where Jaune is the only one in his team who can master a certain martial art that is key to defeating a new type of Grimm. This would put him in a position of great responsibility as he has to train hard and quickly to teach his teammates at least the basics. It creates a lot of tension and character growth as he struggles to become proficient enough to save the day.