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.
They might be really surprised. Some of them could find it funny to see how fans imagine their adventures and relationships. For example, Superman might be amused by the creative ways fans write about his powers and his interactions with Lois Lane in the fan - made stories.
There might be. It's not uncommon for fanfiction to blend different universes. In such a fanfiction, the Justice League members, like Superman or Batman, could be watching Naruto and having various reactions. Superman might be impressed by the strong will of the ninja characters, while Batman could be analyzing their combat strategies. However, it may not be easy to find, but with a good search on relevant fanfiction platforms, you might get lucky.
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.
I think Flash himself would be really interested. After all, it's about him. He'd be curious to see how the writer of the fanfiction portrays his character, his powers, and his relationships with the other members of the Justice League.
They might be quite amused. The Justice League members, with their own complex backstories and powers, would see different interpretations of the Arrow universe in the fanfiction. Some might find it interesting to see how fans envision the crossovers or alternate storylines that could involve Arrow characters.
They might be quite surprised. Some members might find the different interpretations of magic and heroic concepts interesting, while others could be critical of how the Fate world's rules are applied in the fanfiction.
Well, it could be about the Justice League members sitting down and reacting to the Flash's adventures in the fanfiction. Maybe they laugh at his silly mistakes or are in awe of his heroic deeds in the made - up stories.
They might have a range of reactions. Superman could be amused or a bit confused by some of the wilder interpretations of Batman. Wonder Woman might find it interesting to see how fans perceive the Dark Knight's world. Flash might laugh out loud at some of the more comical fanfictions.