One plot idea could be that Nyssa and Sara find an abandoned baby during one of their adventures. They then have to figure out how to take care of it while also dealing with their enemies. Another could be a future - fic where they decide to adopt a baby together and the story follows their journey through the adoption process. Maybe there could also be a story where a magical baby appears in their lives and they have to protect it from dark forces.
Nyssa's background as an assassin from the League of Assassins can bring a sense of danger and mystery to the story. She has the skills to protect the baby from any physical threats. Sara, on the other hand, with her experience as a time - traveling vigilante, can use her knowledge of different times and places to find resources for the baby. For example, if they need a special medicine, Sara might know where and when to find it.
Both of them would likely become more community - oriented. Instead of just fighting villains, they would start to think about how to make the world a better place for their children to grow up in. They would also become more patient as they learn to deal with the physical and emotional changes that come with pregnancy. Their relationship with each other would deepen as they share this unique experience and rely on each other for support.
One plot idea could be that they discover their pregnancies around the same time and support each other through the journey. They could face challenges like how to balance their superhero duties with impending motherhood. Another idea is that they find out they are pregnant due to some sort of magical or scientific accident that they then have to deal with together. Maybe they have to find a way to protect their unborn children from villains who might target them because of their parents' abilities.
One plot idea could be Sara and Nyssa teaming up to take on a new threat in Star City that the other Arrow characters are unaware of. They use their unique skills and their shared history to outwit the enemy.
Their relationship can be developed by having them communicate more deeply about their past traumas. For example, Sara could open up to Nyssa about her time with the League of Assassins and how it affected her. This would bring them closer.
Sara could look for any weaknesses in her restraints. If she's tied up, she might find a loose knot or a sharp edge to cut the ropes. Then she could try to find a way out of the place she's being held. Maybe there's a window or a door that she can use to get away.
One idea could be a crossover where Naruto is on a mission in Gotham and he crosses paths with Nyssa al Ghul. They initially have a misunderstanding but then realize they can help each other against a common enemy, like a group of rogue ninjas and assassins working together.
Obviously, Nyssa is a main character. She is likely to be the central focus of the story, driving the plot forward with her actions and decisions. Another main character could be her first Pokemon, which she has a special bond with. This Pokemon might be her constant companion throughout her adventures.
Romance is also a prevalent theme. Many fanfictions explore the possibility of a romantic relationship between Ash and Nyssa. This could involve them slowly realizing their feelings for each other over the course of the story. For instance, they start off as friends but then small moments of attraction start to surface. It could be a very sweet and slow - burn type of romance.