What could be the reasons for a fight between Nightwing and Batman in fanfiction?

In fanfiction, the winner often depends on the story's theme and the writer's intention. If the story is about the new generation surpassing the old, then Nightwing might win. But if it's about the indomitable nature of the original, Batman would likely be the victor. Also, external factors like the presence of allies or the use of special gadgets can greatly influence the outcome of the fight.

One reason could be a difference in their methods. Robin might think Batman is too strict or old - fashioned in his approach to crime - fighting, and wants to do things his own way more freely. Maybe Robin has been influenced by new ideas or allies in Young Justice that Batman doesn't approve of.

One reason could be the inaccurate characterizations. Fanfiction writers might not fully understand the nuances of Nightwing or Batman's personalities, and Nightwing hates seeing a wrong version of them. For instance, if Batman is made too soft or too harsh in a way that doesn't match the established canon.

Jealousy could also play a part. For example, if Harry starts getting closer to other mentors or friends, Sirius might feel left out and act out in a way that causes a fight. Or if Sirius seems to be spending more time on Order of Phoenix business than with Harry, Harry could feel neglected and start an argument.

It can symbolize protection. Batman is the mentor, and when he carries Nightwing, it shows his instinct to keep Nightwing safe from harm, whether it's physical harm from villains or other threats.

One reason could be a misunderstanding. Maybe Batman suspects Wonder Woman of being involved in something she's not, like a potential threat to Gotham that he misinterprets. Another could be ideological differences. Batman is very much about justice in his own city, while Wonder Woman has a more global and myth - inspired view of justice.

Another reason might be the stress of their quests. They are constantly under pressure to save the world or their friends. This stress can build up and cause them to lash out at each other. For instance, if a quest isn't going well and they keep hitting dead ends, they might start blaming each other for mistakes made along the way.

It could be due to a misunderstanding about their respective roles in their group or in a mission. For example, if Sirius thought James was taking too much of a leadership role without consulting him, it might cause a rift. In fanfiction, the writer might explore how their strong personalities clash in such situations.

Maybe he wants to blend in better. If he's in a situation where he needs to gather information undercover, showing off his skills would blow his cover. So he hides them to seem like an ordinary person until the right moment to strike.

Ink could be a great antagonist. He has the ability to manipulate his body into various weapons and forms. He could be seeking to take over Gotham's underworld in the 'Batman Beyond' era and sees Nightwing and Batman Beyond as threats to his plans.