Some fanfictions play with the idea of power - swapping. Maybe a young hero from Young Justice gets the powers of a Justice League member and vice versa. It's a really cool concept as it forces the characters to adapt to new abilities and challenges, and it often leads to some really fun and unexpected storylines.
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.
A third interesting storyline might involve a secret alliance between a member of the Justice League and a villain that the Young Justice team discovers. This discovery then sets off a chain of events where the Young Justice team has to decide whether to trust the rest of the Justice League and how to handle this new information without causing a complete breakdown in the superhero community.
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.
In DBZ and Justice League fanfiction, a common concept is the idea of training together. For instance, the Saiyans could teach the Justice League members how to harness their ki. This could lead to new power - ups for the Justice League characters. Another aspect is the exploration of different moral codes. The Saiyans have a different view on combat and honor compared to the Justice League. Fanfiction can delve into how these two groups might influence each other's perspectives. There could also be a story where the villains from both universes team up, forcing the heroes from DBZ and the Justice League to combine their forces to stop them.
One interesting concept could be the fusion of the unique powers from the Justice League members and the ninjutsu of Naruto characters. For example, Superman's super strength combined with Naruto's Rasengan technique. Another concept might be the cultural clash between the DC universe's modern settings and Naruto's more feudal - like ninja world. Also, the idea of Naruto characters learning about the Justice League's sense of justice and how it differs from their own ninja code is quite fascinating.
In Spiderman Justice League fanfiction, a great concept is the clash of ideologies. Spiderman has his own moral code that he developed in the streets of New York, while the Justice League has its own set of principles. Their interaction could lead to interesting debates and character growth. Also, imagine Spiderman's acrobatic fighting style being incorporated into the League's battle strategies. It would add a new dimension to their combat against villains.
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.
They might be really surprised. Some fanfictions could show their characters in very different ways than they expect. For example, they might see relationships between characters that they never thought of in the official story. It could be both amusing and a bit strange for them.
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.