Well, there could be a lot of interesting things. Maybe the Justice League members would be surprised by the Batfamily's unique skills and tactics. For example, Batman's detective skills might impress Superman. They could team up to fight a common enemy in Gotham City. The Flash might be in awe of Robin's acrobatic abilities.
Well, there could be epic battles. The Justice League's powerful members like Superman and Wonder Woman might be initially shocked by the Batfamily's gritty and unorthodox methods. Maybe Batman has to mediate between his family and the League to avoid misunderstandings.
Obviously, Batman and his family like Robin, Batgirl would be main characters from the Batfamily side. And from the Justice League, Superman, Wonder Woman, Flash etc. would be the main characters. They are the most well - known members of their respective groups.
Batman, for sure. He has such a complex relationship with the Justice League already. Meeting his family in this context would add another layer to his character. He's the bridge between the two groups.
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.
One possible storyline could be a joint mission against a powerful new villain. The Batfamily's detective skills combined with the Justice League's raw power would be a great combination. Another could be a sort of 'cultural exchange' where the League members try to understand the Batfamily's no - kill rule and the family tries to adapt to the League's more open - ended approach to heroism.
A possible plot could involve a member of the Batfamily getting kidnapped and the Justice League helping to rescue them. During the rescue, they discover a secret weapon or technology that the villains were planning to use against the world, and they have to work together to stop it.
In such a fanfiction, they might team up to fight a powerful new villain. For example, a super - intelligent alien who plans to take over the Earth. The Justice League could initially be skeptical of Supergirl, but as they see her powers in action, they come to respect her.
In a 'Justice League meet Catwoman' fanfiction, Catwoman might initially be seen as a threat. She could be stealing some valuable items, and the Justice League comes to stop her. But then, she might end up teaming with them to take on a bigger bad guy, like a powerful alien invader.
Well, there could be epic battles between the characters. For example, Thor might face off against Superman. Their superpowers are quite different but equally powerful, so it would be a spectacular showdown.