In such a fanfiction, there could be epic battles. The superpowers of both groups would clash. For example, Superman's strength against Thor's might. It would be a test of different ideologies too. The Avengers might be more about protecting Earth from all threats, while the Justice League has a broader view including intergalactic threats.
It's hard to say. Superman has incredible strength, speed, and heat vision. But Thor has the power of lightning and is a god. Hulk's brute strength is also a force to be reckoned with. In a fanfiction, it could depend on the situation and how the writer wants to portray their power levels.
Well, in an 'avengers meets justice league fanfic', a lot of character interactions are possible. Thor could share his knowledge of Asgardian magic with Wonder Woman who has her own set of magical items. Captain America and Aquaman might have a conversation about leadership and protecting their respective worlds. Also, the Scarlet Witch could use her powers to create illusions that would trick some of the Justice League members.
In such a fanfiction, there might be a big threat that requires both teams to combine their skills. The Flash could race with Kid Flash and share some speed - related tips. And Wonder Woman could train the female members of Young Justice in combat.
Another possibility is a post - Endgame fanfiction. After the events of Endgame, the Avengers discover a new threat that has ties to the Justice League's world. Maybe a powerful villain from the DC universe has somehow been awakened by the events in the Marvel universe. So they have to reach out to the Justice League for help and together they figure out a way to stop this new threat.
Yes, there are many good ones. You can find them on fanfiction websites. Some focus on epic crossovers between the Justice League and the Avengers, with amazing battles and team - ups.
The Phantom Troupe could form an uneasy alliance with some of the more morally grey members of the Justice League, like Catwoman or Lobo. They might team up to take down a common enemy that the League can't deal with using their usual methods because of legal or moral constraints.
Brucie in this fanfiction could be someone who has been living on the fringes of society. He might be a street - smart person who has a deep understanding of the underbelly of the city. When the Justice League meets him, they realize that his knowledge can be useful in their fight against crime. He could also be a bit of an outcast, which makes his relationship with the super - heroes all the more interesting.
I think Thor and Wonder Woman would be really interesting. Thor is a god from Asgard with his hammer Mjolnir and control over lightning, while Wonder Woman is an Amazonian princess with her Lasso of Truth and super strength. Their different mythological backgrounds would make for some great exchanges and potential team - up action.
One popular theme is crossovers. Writers like to bring the characters from the Avengers and the Justice League together and see how they interact. For example, seeing Thor and Superman have a friendly competition or Iron Man and Batman sharing their tech knowledge.