Who would be the main antagonist in a 'Batman meets Justice League' fanfiction?

It could be a new villain who has a vendetta against both Batman's family (including Batmom) and the Justice League. Maybe a powerful criminal mastermind who has studied both sides and found their weaknesses.

It could be the Joker. Since he's one of Batgirl's main foes in Gotham, his chaotic nature would pose a great threat to the Justice League as well when they enter Gotham's affairs.

The Riddler could be a great antagonist. He might have a grand scheme that not only affects Gotham but also has implications for the Justice League's interests. His riddles could stump both Robin and the League members, forcing them to work together to decipher his plans.

Obviously, Batman and the members of the Justice League are the main characters. Batman is the Dark Knight, known for his intelligence and combat skills. And then there's Superman, the Man of Steel with super strength and other powers. There's also Wonder Woman, a powerful Amazon warrior.

The Joker could be a great antagonist. Imagine him being intrigued by the formation of the Justice League after Batman's start in 'Batman Begins'. He could see it as a new toy to play with and start causing chaos in a way that targets both Batman's Gotham roots and the League as a whole. He might use his mind games to try and turn the League members against each other.

In addition to Batman, Superman, and Wonder Woman, The Flash could also be a main character. His super - speed would add an element of quick - paced action and his humorous personality would provide some levity. Aquaman, with his connection to the ocean and his trident, is also likely to be a main character. He can bring in a different perspective, especially when it comes to underwater or environmental threats. Green Lantern, with his power ring and willpower, would also be important as he has unique abilities that can be used in various ways to fight threats.

In this fanfiction, Batman might show off his detective skills to the Justice League. He could solve a mystery that the other members couldn't. For example, he might find out the true identity of a new supervillain faster than Superman or The Flash.

In a 'Batman meets Justice League' fanfiction, there could be an epic team - up against a powerful new villain. Maybe Batman's detective skills would be crucial in uncovering the villain's plan while the other Justice League members use their superpowers to fight on the front line.

Ink could be a great main antagonist. He has the power to manipulate shadows and could use this ability to create chaos in Gotham and beyond. He might target the Justice League and Batman Beyond because they represent order and he wants to spread his own brand of darkness.

Obviously, Batman's kids would be main characters. Depending on which kids are included, it could be Robin or Batgirl, etc. And of course, the members of the Justice League like Superman, Wonder Woman, Flash, etc. would also be main characters as they are meeting Batman's kids.