They might be shocked at the alternate versions of themselves and the events in the Injustice fanfiction. It could make them reflect on their own actions and relationships in their own universe.
A fanfiction Justice League meeting might involve the introduction of a new hero. This new hero could be from a different planet or have a very unique power. During the meeting, the other members of the Justice League would be sizing up this new addition. Wonder Woman could be testing the new hero's combat skills and moral compass while Flash might be curious about their speed or other abilities.
In a 'Young Justice vs Injustice League' fanfiction, the Young Justice team might use their teamwork and strategic skills to their advantage. They are younger and more agile, so they could potentially outmaneuver the Injustice League. For example, Robin's detective skills could be used to find weaknesses in the Injustice League's plans.
Wonder Woman could be the most vocal as well. She represents truth and justice in a very direct way. In a fanfiction meeting, she would likely voice her concerns about any actions that might go against the values of the Justice League. She would also be quick to support any initiatives that promote peace and equality, and would make sure her voice is heard when important decisions are being made.
Definitely Superboy from Young Justice. His super strength would be crucial in direct confrontations with the Injustice League. Also, Lex Luthor from the Injustice League as he is a mastermind and his plans would drive much of the conflict.
One possible storyline could be Deadpool trying to prove himself worthy to join the Justice League. He'd go through a series of zany and dangerous trials, all while making inappropriate jokes and breaking the fourth wall. Another could be that Deadpool is accidentally transported to the Justice League's universe and they have to figure out how to send him back, but he causes so much trouble in the meantime.
In a Naruto in Justice League fanfiction scenario, Naruto would have a lot to offer. He has a vast amount of chakra which could be used for various purposes like powering up the League's technology or creating barriers. His relationship with his teammates in Naruto like Sasuke and Sakura could be paralleled with the relationships in the Justice League. Naruto might have some initial cultural clashes with the League members as he comes from a different world, but over time, he would learn to adapt and they would learn from his unique skills and way of thinking. His Sage Mode would give him an edge in battles, allowing him to sense danger more acutely and react faster.
Definitely not. Justice League is a creation of DC Comics. Marvel Comics has its own set of superhero teams and characters that are distinct from those in the Justice League.
The Flash might initially be in denial. He's used to Batman always having a plan and his death would be a huge shock. He would then turn his speed into a tool for investigation, trying to find out exactly what happened. Green Lantern could feel a sense of loss but also be spurred into action, using his ring to try and prevent future tragedies like Batman's death. He might create constructs in Batman's memory to inspire the team.