They would be amazed. The Justice League is used to their own brand of super - powered battles, but Infinity War would show them a whole new level of cosmic warfare. Superman might be the first to jump into action, mentally preparing himself to take on Thanos if he was in that universe.
The plot could involve the Justice League facing off against Thanos. Maybe Superman tries to take on Thanos one - on - one at first, but realizes he needs the whole team. Batman could be strategizing on how to get the Infinity Stones away from Thanos. Wonder Woman could be leading the charge in the battle scenes, using her strength and skills. And Flash could be using his speed to either steal the stones or disrupt Thanos' attacks.
Aquaman would likely be intrigued by the otherworldly settings and creatures in Infinity War. He might think about how the underwater world he rules could be affected if something like the events in the movie occurred. Green Lantern, if included in the Justice League for this scenario, would be concerned about the scope of power Thanos wields and how the Lantern Corps could handle such a threat.
Darkseid would be a great main villain. He's already a powerful and well - known foe in the DC universe. He could be the one who starts collecting the Infinity Stones - like items to gain ultimate power and rule over all universes. His army could also be involved, making it a large - scale war for the Justice League.
Perhaps in the fanfiction, the Infinity War concept causes some members of the Justice League to turn on each other. Maybe the power of the Infinity Stones - like objects corrupts some of them, like if Flash gets too tempted by the power of speed - enhancing stones and starts causing chaos instead of helping. Then the rest of the team has to figure out how to stop their former ally and also the external threats.
Well, if the Justice League were watching Infinity War in a fanfic, it could be really interesting. Aquaman might be amazed at the underwater scenes in Infinity War and make comments about how his own underwater world compares. The Flash would probably be cracking jokes about how slow some of the characters seem compared to his speed. And Cyborg could be interested in the technology shown in the movie.
Batman would be a great character to focus on. He doesn't have superpowers like the others but his intelligence and strategic mind are his greatest assets. In a 'Justice League Infinity War' fanfic, he would be the one trying to figure out the complex nature of the Infinity Stones, coming up with plans to outwit Thanos. He might also have some tense moments where he has to rely on the super - powered members of the League in ways he's not used to, which could lead to some great character growth and interesting interactions.
Well, while watching Infinity War in the fanfic, the Justice League's dynamic could shift in many ways. They could become more united as they see the importance of teamwork in Infinity War. Or they could get into arguments about the morality of some of the actions in the movie.
Some members might be shocked. Wonder Woman, for instance, who respects Batman's skills and tenacity, would likely be very disappointed. She might try to persuade him to stay, emphasizing the importance of his presence in the team. Superman, on the other hand, might initially be understanding, as he knows Batman has his own way of doing things. But he would also be concerned about the power vacuum that Batman's departure would create. Aquaman might be more indifferent, thinking that Batman was always an outsider to some extent, with his focus mainly on land - based issues.
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.