One idea could be a crossover where the Young Justice team gets accidentally transported to the Avengers' universe. They could team up to fight a common enemy like Thanos who has somehow also gained control over some of Young Justice's villains. The different powers and personalities would create a lot of interesting dynamics.
A fanfiction could be about a villain who creates a device that merges the worlds of Young Justice and the Avengers in a chaotic way. Heroes from both sides have to quickly figure out how to work together to reverse the effects while dealing with new threats that are a result of the merge.
One idea could be that the Avengers end up in the Young Justice universe due to a malfunctioning portal. They team up with the Young Justice team to fight a common enemy, like a powerful alien threat that neither group could handle alone. The characters' different skills and personalities would create great interactions.
One interesting story could be a crossover where the Young Justice team and the Young Avengers have to team up to face a common enemy from another dimension. They start off with misunderstandings due to their different methods but eventually learn to work together.
Maybe a villain from the Justice League's rogues gallery teams up with an Avengers foe. Let's say Lex Luthor and Doctor Doom. They create a device that can swap powers between heroes from both teams. This leads to some really fun and chaotic situations. For instance, Captain America with the Flash's speed or Wonder Woman with the Hulk's strength. The two teams have to figure out how to work with their new, swapped powers and stop the villains.
One idea could be a crossover where the Young Justice team has to team up with the Justice League to face an interdimensional threat. Maybe a powerful villain from another dimension is trying to invade Earth and the combined skills and powers of both groups are needed to stop it.
Maybe a story where some of the younger members of the Young Justice team are frustrated with the Justice League's methods and decide to take on a mission on their own, but end up getting in over their heads and have to call in the League for help. This could lead to a lot of character development and some interesting dynamics between the two groups.
One idea could be Goku arriving in the Young Justice universe due to a rift in space - time. He could initially be confused but quickly adapt and start training the young heroes, sharing his Saiyan techniques like the Kaio - ken.
One idea could be exploring new character backstories. For example, you could delve deeper into the origin of a less - known character in the Young Justice Z universe. Maybe they have a hidden power or a tragic past that has yet to be fully explored in the existing canon.
A cool Young Justice gamer fanfiction could revolve around a game tournament. The heroes participate in a high - stakes gaming competition where the loser has to face some sort of consequence in the real world. This could lead to intense rivalries and strategic gameplay within the story. Also, a story where the team discovers a hidden game level that holds secrets about their past or future could be really engaging.
One idea could be a time - travel fanfiction. The Young Justice Team gets sent back in time to the early days of the Justice League. They have to work in secret to fix a disruption in the timeline without being detected by their heroes - in - training selves. This would create a lot of interesting scenarios where they see the origin of the League and try to blend in while on their mission.
One interesting idea could be the role reversals in relationships. For example, if in the original a male character was the leader, in the genderbend fanfiction, a female character might take on that role. This can lead to new power dynamics and character interactions.