In a Batman's birthday fanfiction, perhaps Batman himself would take a day off from his usual brooding. He could let his guard down a little and have a heart - to - heart talk with Alfred about his parents. The other members of the Bat - family might also share their memories of how Batman influenced their lives. And there could be a new villain emerging on this day, but instead of immediately fighting, Batman uses his wits and the help of his friends to outsmart the villain without any major violence.
Well, the Joker might try to crash the party in a very Joker - like way. Maybe he sends a bunch of exploding presents. Or, Catwoman could show up with a stolen jewel as a gift, with a note saying 'Happy Birthday, Bat - man, but I had to steal this first'. The Bat - family would then have to deal with these unexpected guests while still trying to make the day special for Batman.
On Batman's birthday, Gotham City was oddly quiet. Bruce Wayne, as always, started his day with a solitary workout in the Batcave. Alfred had prepared a small, elegant cake. The Bat - family decided to throw a surprise party for him. Dick Grayson brought a gift - a new gadget he designed for the Batmobile. As the day went on, Batman patrolled the city briefly, and when he returned to the manor, he was greeted with the warm celebration. It was a rare moment of normalcy and joy for the Dark Knight.
She could become an ally of Batman. Despite her father's villainy, she might see the error of his ways and decide to help Batman fight crime in Gotham. This would be a huge twist in the Batman - Penguin dynamic.
One possibility is that Batman lifting Thor's hammer could create a rift between him and the Justice League. Some members might be jealous or worried about his new - found power. Superman, for example, might be concerned that Batman is getting too powerful. On the other hand, Thor himself could come to Earth to retrieve his hammer and there could be an epic battle or an unexpected alliance between the two.
In a fanfiction, Elsa's powers could be a key factor in saving Gotham from a new super - villain. Maybe this villain has a device that can control the weather, and Elsa's ice powers are the only thing that can counteract it. Batman would then provide the strategic support, guiding Elsa on when and where to use her powers for maximum effect. They would form an unlikely but powerful alliance.
Maybe Batman gets jealous when Catwoman teams up with another anti - hero. He's so used to being her main partner in crime - fighting (sort of), and this new alliance makes him feel left out. It would be an interesting angle to explore how his jealousy affects their dynamic.
In such a story, you might have guests arriving with funny presents, or someone could accidentally spill something and cause a little chaos. Also, the birthday person could make a touching speech.
Well, he might receive a mysterious gift that leads him on an adventure. Maybe it's a clue to a long - forgotten case. So he starts following the trail, which takes him all around Gotham. Along the way, he runs into some of Gotham's rogues who are also intrigued by the mystery gift. But in the end, he figures it out and it turns out to be a really special present from Bruce Wayne, like a piece of his father's old detective work.
Naruto might go to the Hokage Rock and sit there alone, looking at the village below. He thinks about how far he has come and yet, on this special day, he doesn't have anyone to share it with. His mind drifts to his parents and how he wishes they could be there for his birthday. He then decides to do something good for the village in their memory, like cleaning up some of the less - visited areas.
Well, he might be initially confused. Batman is so focused on his mission in Gotham that fanfiction about a character like Slade might seem very strange to him. He could start investigating if he thought it had any connection to real - world threats or if it was somehow influencing public perception in a negative way.
In a wedding fanfiction, there could be a grand ceremony in a secret, exotic location. Talia al Ghul would likely bring in elements of her own culture and the League of Shadows. There would be a clash of Batman's more understated, dark aesthetic with the opulence and mystery of the al Ghul family. Maybe there would be a moment where Batman has to prove himself worthy in the eyes of Talia's father, Ra's al Ghul. It could be a test of his skills or his loyalty to Talia.