Some of them might be amused. They could find the different takes on their characters and stories quite entertaining. For example, Superman might chuckle at a fanfic that has him in a comical situation.
Some fanfictions worth checking out are 'The Secret Justice League'. In this one, there are hidden secrets among the members that start to surface. 'Justice League: Origins Redux' reimagines how the Justice League was formed in a more detailed and unique way. Also, 'League of Shadows and Light' plays with the concept of good and evil within the League, making for a really engaging read.
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.
One great 'Young Justice Dimension: Justice League' fanfiction is 'The New Recruits'. It focuses on how new members are integrated into the team. The story has great character development and exciting action scenes.
You can start by visiting popular fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. Just type 'Justice League' in the search bar, and you'll get a whole list of relevant fanfictions.
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.
Yes, there are likely to be such fanfictions in the vast world of fan - created content. The idea of Clark (presumably Superman) being kidnapped in a Justice League - related fanfiction can offer a unique and exciting plot twist for fans to explore different character dynamics and storylines.
I highly recommend 'Justice League: The Lost Years'. This fanfiction delves deep into the backstories of the members. It's full of action, mystery, and some really cool alternate versions of their powers. It's a long read but definitely worth it.
You can start by looking on fanfiction platforms like Archive of Our Own (AO3). It has a vast collection of fanfics, and you can simply search for 'Young Justice Justice League deaged' in the search bar. Another option is Fanfiction.net, which also has a large number of fan - created stories. Some Tumblr blogs may also feature or recommend such fanfictions. Just search for relevant tags like #YoungJustice #JusticeLeague #deaged.