The fight would be a clash of two very different fighting styles. Batman is more of a street - level fighter who uses his environment to his advantage. Wonder Woman, on the other hand, has the power of the gods. The fight might start with words but quickly escalate into a physical confrontation, with both trying to prove their point. Batman would be trying to show that his way is practical, while Wonder Woman would be fighting for her principles.
It would be a very unique relationship. Batman would be the more cautious and protective parent, always worried about her safety given his own experiences. Wonder Woman would be the one to encourage her to embrace her powers and use them for good. Their daughter would look up to both of them, learning from Batman's intelligence and Wonder Woman's strength.
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.
It might look like a story where the two heroines meet in a dream realm first. They exchange stories about their respective worlds and the challenges they face. Then, they find out that there is a real - world connection between the akumas in Paris and some dark magic in Wonder Woman's world. They decide to work together to stop it.
It could also be a matter of miscommunication. In some fanfics, Batman and Wonder Woman may not communicate well. Batman is often a man of few words and his actions can be misinterpreted. He might be so engrossed in his own investigations that he doesn't take the time to listen to Wonder Woman, giving the impression that he's ignoring her. This can add an interesting layer of conflict to the fanfic story.
The story could start with some sort of magical or scientific accident that causes the body swap. Batman would suddenly find himself in a female body with super strength and a lasso of truth. He'd have to figure out how to use these new abilities while also maintaining his identity. Wonder Woman, on the other hand, would be in the dark and gritty world of Gotham. She'd probably use Batman's gadgets in a more straightforward way than he does, and her presence would likely change the dynamic between Batman's allies and enemies.
It could be described as a meeting of different worlds. Batman's dark and gritty Gotham style meets Wonder Woman's more mythical and heroic Amazonian nature, and Robin is there in the middle, representing the new generation of heroes. The encounter might be filled with a sense of awe from Robin towards Wonder Woman, and a mutual respect between Batman and Wonder Woman as they size each other up.
Supergirl could potentially win. She has the same powers as Superman under a yellow sun. Her heat vision can be extremely powerful. If she uses her speed and heat vision in a coordinated way, she could overpower Wonder Woman. Also, Supergirl might be more adaptable in different environments as she has had to face various threats on Earth and in space.
Another way is through personal challenges. Let's say Batman faces a personal crisis that only Superman and Wonder Woman can help him with. This could lead to a deeper emotional connection. Superman might open up more about his alien heritage and the loneliness he sometimes feels, and Wonder Woman could share her experiences from Themyscira. As they support each other, their relationships grow.
Their relationship could become more trusting. Since Batman saves Wonder Woman, she might start to see him as more than just a brooding vigilante. She could open up more to him and share her fears and secrets.
A Batman and Wonder Woman marriage in fanfiction would likely be a complex affair. Firstly, their different upbringings would play a major role. Batman, raised in Gotham's dark alleys, and Wonder Woman, from the idyllic Themyscira. Their relationship would be a blend of his cynicism and her idealism. In terms of power, they are both at the top of their game, so they would be equals. However, their public personas are so distinct. Batman is the dark knight, feared by criminals, while Wonder Woman is a symbol of hope. In fanfiction, this marriage could explore how they reconcile these differences and build a life together, all while saving the world on the side.