Well, perhaps there would be a big threat that the Justice League and the Batkids have to face together. The Batkids' street - level knowledge and the Justice League's superpowers would combine to defeat the enemy. The Batkids could also learn a great deal from the more experienced Justice League heroes, like Batman learning new strategies from Wonder Woman.
The main characters would include the heavy - hitters of the Justice League. Batman would be a key link between the two groups as he is part of the Justice League and also the mentor of the Batkids. The Batkids, including the various incarnations of Robin, would be important as they bring their own unique perspectives and skills. And of course, characters like Wonder Woman would be there, adding her Amazonian strength and wisdom to the mix, and her interactions with the Batkids could be really interesting, like teaching them about ancient combat styles.
Maybe a plot where there's a competition between the two groups. A powerful and eccentric billionaire sets up a series of challenges across the city. The winner gets a large sum of money for their cause. At first, it's all about competition, but as the challenges get tougher and more dangerous, they start to cooperate and combine their resources to complete the tasks. This also leads to some friendly rivalries and new friendships forming.
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.
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.
Definitely Robin from the Batkids and Superboy from Young Justice. Robin is the highly skilled detective and acrobat, while Superboy has superhuman strength and a bit of a temper. Their interactions could be really interesting as Robin tries to use his wits to keep Superboy in line during a mission, and Superboy might get frustrated with Robin's over - planning at times.
Well, in such a fanfiction, there could be a lot of interesting scenarios. Maybe Batman would have to deal with the different leadership styles of the Justice League while trying to keep his family in line. The Batfamily members could show off their unique skills to the League members, like Robin's acrobatics or Batgirl's hacking skills.
In this fanfiction, Ladybug might show off her unique powers to the Justice League members. For example, her yoyo could be a source of great fascination as it has various functions like swinging around and also being a weapon. Maybe she'll team up with Superman to fight a common enemy. Her small size compared to the League's powerhouses could add an interesting dynamic, like a little but mighty hero among giants.
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.