Yes, there are likely fanfics out there with Batman and Wonder Woman getting married. The DC Comics fan community is quite creative, and many fans like to explore different relationship dynamics between their favorite characters through fanfiction.
Well, the plot could involve Batman and Wonder Woman coming together because they see a unique strength in each other that no one else in the DC universe has. Their marriage might be a way to unite two very different ideologies. For example, Batman's more grounded, gritty approach and Wonder Woman's idealistic view. As they are married, they could go on missions together where their combined skills prove to be a great asset. But they also face internal struggles within the relationship. Batman might struggle with opening up completely to Wonder Woman due to his past traumas, while Wonder Woman tries to get him to trust more. And of course, there could be external threats from villains who see their union as a threat to their own plans in the DC world.
Well, in some fanfictions, their married life might be a bit of a struggle. Batman's brooding nature could clash with Wonder Woman's more positive and idealistic outlook. However, they would also learn from each other. For example, Batman could become more open - minded under Wonder Woman's influence, and she could learn about the darker side of humanity from him. They would support each other in protecting the world, with Batman handling the more stealthy and detective - like operations while Wonder Woman took on the more upfront battles.
She could be devastated. Wonder Woman might go into a period of mourning, isolating herself from others as she grapples with the loss. She was used to having Batman as an ally, and his death would leave a big hole in her life.
Their powers could also combine in a more defensive way. Batman's gadgets could be enhanced by Wonder Woman's magic. Maybe he could create some sort of shield using her magic lasso. In a battle, this could protect them from powerful energy blasts or attacks. And Wonder Woman could use Batman's knowledge of technology to upgrade her own weapons, like making her bracelets even more effective against various threats.
In Batman and Wonder Woman fanfic, 'branches' could refer to different storylines or plot directions. For example, a fanfic might start with a common premise, like Batman and Wonder Woman teaming up to fight a new villain in Gotham. Then, one branch could be that they discover the villain has ties to an ancient Amazonian curse, leading them on a journey to Themyscira. Another branch might involve the villain being part of a secret society in Gotham, which Batman has to infiltrate with Wonder Woman's help.
At first, it might be a bit rocky. Batman is used to working alone and being in control, and Wonder Woman is a powerful and independent hero. But as they face challenges together, they would start to respect each other's abilities. They could develop a friendship based on mutual admiration for their different skills.
After the proposal, their relationship would likely become more public. They would no longer be just comrades in arms but an engaged couple. Their interactions would be more affectionate and they would start planning a future together.
After getting married, their relationship would become even more of a partnership. They would be more open with each other about their strategies in fighting crime. Batman might share some of his darkest secrets with Wonder Woman, knowing she would understand. And Wonder Woman would be able to bring more of Batman into the world of the Amazons, introducing him to new ways of thinking about justice. Their love would make them stronger both in and out of the fight.