In some fanfictions, their marriage could lead to a uniting of different groups. If Jaune has connections to certain people and Ruby has her own allies, their union could bring about a stronger front against the Grimm. They could also go on adventures together, exploring new parts of Remnant that they haven't seen before, all while being a married couple and relying on each other's skills and love.
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.
Weiss could be one. Since she's Ruby's teammate, she might play a role in the fanfiction. Maybe she's initially skeptical about their relationship but eventually comes to support them. Another could be Blake. She could be involved in helping them out in some situations, like when they face difficulties in their married life. And of course, their mentors like Ozpin or Qrow could also make appearances. Ozpin might offer some wise advice about their relationship, while Qrow could be more of a protective figure, especially towards Ruby.
A plotline could involve them having to deal with political or power - related issues. Since they might come from different backgrounds in the original story, their marriage could stir up a lot of trouble in the power dynamics of their world. For example, there could be factions that oppose their union, and they have to fight to stay together.
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.
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.
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.
A plotline could involve time travel. Maybe Cinder goes back in time and ends up getting married to Jaune Arc. This changes the course of the whole story, and they have to deal with the consequences of this new timeline. It's a really exciting concept that can lead to a lot of interesting story developments. In this kind of plot, they would have to figure out how to navigate their relationship while also dealing with the changes in the world around them. There could be a lot of conflict and also a lot of room for character growth.
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.
One possible plotline could be Ruby being wrongly accused of a crime in Vale. She then has to use her combat skills and her wits to clear her name while also dealing with the real criminal who framed her. This could involve her team, RWBY, splitting up to gather evidence and facing various challenges along the way.
Perhaps there could be a plot where Ruby has to keep her status as a Maiden a secret from her friends at first. This could lead to some interesting misunderstandings and internal conflict as she tries to protect them without revealing the truth.
A plotline could also revolve around Ruby's insecurities during pregnancy. She's always been seen as a strong and fearless leader, but now she might be worried about not being able to protect her child. The fanfiction could show her journey of overcoming these insecurities and growing into a more confident mother - to - be.