One possible plot could be that Bruce's goddaughter discovers his secret identity as Batman. She might initially be shocked but then decides to help him in his fight against crime. Maybe she uses her own unique skills, like being a tech - savvy hacker, to assist Batman in gathering information on his enemies.
Perhaps the goddaughter starts to suspect that Bruce is involved in some dangerous activities. So she begins her own investigation. As she digs deeper, she stumbles upon the world of Gotham's underworld and the Batman. She then has to decide whether to confront Bruce or keep his secret. Meanwhile, she also has to deal with the threats that come her way as she gets closer to the truth.
The Joker could be a great main villain. His chaotic nature would pose a huge threat to Bruce's goddaughter. He might target her just to mess with Batman, knowing how much she means to him.
One idea could be a story where Rachel survives and she and Bruce try to have a normal relationship while still dealing with the crime in Gotham. Maybe she becomes more involved in his crime - fighting efforts in a non - violent way, like helping with the rehabilitation of criminals he catches.
The plot could involve Inuyasha being in a dangerous situation during a dark and stormy night. Maybe he's facing a powerful new enemy that emerges under the cover of the storm. The storm could also be a magical creation by an evil force to hinder Inuyasha's movements.
You could also say their relationship is one of contrasts. Bruce is dark, brooding, and lives in the shadows as Batman, while Rachel is a symbol of light, justice in the legal sense. She represents the hope that Gotham can be saved through the law, while he takes a more direct and often violent approach. Their love bridges these two different worlds, at least for a while.
Their characters could also be developed through conflict. For instance, they might have different ideas on how to deal with a particular villain. This would force them to communicate and understand each other better, leading to growth in their individual characters and in their relationship.
It could be Kakashi. He has that mysterious and brooding quality like the Dark Knight. He's also highly skilled and has a strong sense of justice. He could be the one who lurks in the shadows of Konoha, protecting it from threats.
A possible plot could center around Dark Meta Knight getting trapped in a strange dimension in the Kirby Star Allies universe. Kirby and his allies discover him there and at first, Dark Meta Knight is hostile towards them. But as they try to find a way out of the dimension together, they start to understand each other better. Dark Meta Knight could learn about the power of friendship from Kirby and his friends, and by the end of the story, he might have a change of heart and become an ally of sorts, or at least not be as much of an enemy.
One interesting plotline could be Bruce and Selina teaming up to take on a new criminal threat in Gotham that the police are unable to handle. They start off as reluctant allies but gradually grow closer as they face danger together.
The plot could involve the dark knight, who is terminally ill, on a final quest. He might be seeking a cure in a world full of dark magic or ancient secrets. Along the way, he has to face his enemies one last time, using his remaining strength and wits, knowing that his time is limited.
One possibility is that the knight is a hero who has to save the day, and Bruce, Ivy, Harley and Lemon are either allies or foes in different situations. The 'marrying the knight' could be a reward for his heroic deeds, and the story could show how this changes the dynamics among all of them.