If Young Justice discovered fanfiction, there would be a whole spectrum of reactions. For starters, the younger members might be simply fascinated by the fact that people are writing stories about them. They could see it as a form of popularity. However, the older and more experienced members would likely take a more critical look. They would be aware of the potential impact of these fanfictions on their public image. They might engage with the fanfiction writers in a positive way to encourage more accurate and positive portrayals, or they might choose to ignore it all together if they feel it's not in line with their values or mission.
They may have different reactions. The extroverted ones could be excited and start sharing the interesting fanfictions they find among themselves. The more serious ones might analyze how accurate the characterizations are in the fan - made stories. And those who are protective of their image might try to correct any misinformation they find in the fanfictions.
Some of them might be amused. They could laugh at the creative and sometimes silly ideas in the fanfictions.
Some members of Young Justice could be embarrassed. For instance, if there are romantic fanfictions about them that are a bit too cheesy or if their weaknesses are overly emphasized in a not - so - flattering way. But others might be really intrigued and want to explore more of what the fans think about them.
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.
They might be intrigued. The different takes on the MCU heroes and villains could capture their attention.
The more idealistic members of Young Justice like Robin might be immediately suspicious of Loki. He represents chaos and trickery, which goes against Robin's sense of order and justice. He would probably try to keep the team away from Loki until they know his true motives.
Some members of the team might be overjoyed. They could see it as a sign of new life and a positive change for Spitfire. Others might be more cautious, worried about how the pregnancy will impact their ability to fight crime. For example, Batman - if he's part of the team's leadership - might be concerned about their safety and the potential risks to the unborn child during missions.
They would be devastated. Some might go into a state of shock and denial at first. For instance, Robin might isolate himself to try and figure out if there was anything he could have done differently. Superboy could become extremely angry and start lashing out, blaming others or himself for not being able to protect Blue Beetle.
Superboy would be devastated. He has a special bond with Miss Martian, and her death would likely make him go into a rage. He might start lashing out at the enemy without thinking, blaming them for her death. Aqualad, as the leader, would feel a great sense of guilt. He would question his leadership and decisions that led to the situation. He might become more withdrawn and overly cautious in future missions.
Some might be shocked. Clint might just shrug it off as something crazy that fans do.
Dick would probably be excited. He loves the idea of fans being so engaged with their world and would enjoy reading the different takes on their relationships. He might even leave positive comments if he could.
The Justice League as a whole would have a diverse range of reactions. Some members like the Flash would be all for it, seeing it as a fun exploration of Batman. Others like Wonder Woman might use it as a way to understand how the public perceives Batman's role in the League. And then there are those like Aquaman who might just shrug it off unless it directly affects his interests. The fanfiction could also potentially create some internal discussions within the League about how they are all portrayed in the public's imagination.