Maybe in a fanfiction, there's a parallel universe where Batman Beyond and Wonder Woman are part of a super - hero alliance against an alien invasion. Wonder Woman could lead the charge in direct combat, while Batman Beyond uses his detective skills to figure out the aliens' weaknesses. Their relationship could start off rocky as they have different ways of approaching problems, but they learn to work together effectively.
One possible storyline could be a team - up against a new, powerful villain who is causing chaos in Gotham and Themyscira. Batman Beyond with his high - tech gadgets and Wonder Woman with her strength and magic could combine their skills. Maybe the villain has the ability to disrupt time and space, forcing them to travel to different dimensions to stop him.
Good fanfic writing also involves creating believable interactions between the characters. Batman Beyond might be a bit more cynical and used to working alone in the shadows, while Wonder Woman is more open and confident. Their conversations should reflect these differences. Also, don't be afraid to put them in new and unexpected situations. Like, what if they were both shrunk down to a microscopic size and had to fight tiny villains inside a high - tech device? This would force them to rely on each other in ways they haven't before.
In a fanfiction adventure, they might team up to stop a mad scientist who is creating dangerous hybrids of humans and animals. Batman Beyond uses his detective skills to track down the scientist's lair, and Wonder Woman uses her combat skills to fight off the hybrids. Along the way, they have to also deal with the ethical implications of the scientist's experiments.
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.
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.
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.
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.