Well, in batman vs justice league fanfiction, characters like Nightwing and Oracle are prime candidates to side with Batman. Nightwing was Batman's first Robin and has a loyalty to him. Oracle, with her intelligence and access to information, would back Batman if she believed his cause was just. Additionally, characters like Batgirl could also side with Batman, especially if she thought the Justice League was overstepping its bounds.
Batman is obviously one of the most popular. He's a complex character with a lot of depth, and in a 'vs' scenario with the Justice League, his skills and intellect are put to the extreme test. Superman is also popular. His god - like powers in contrast to Batman's more human abilities create a great dynamic. Wonder Woman is another favorite. Her strong moral code and combat skills add an interesting element to the story when she's involved in the conflict between Batman and the League.
Obviously, Batman would be one of the main characters. And of course, the other members of the Justice League like Superman, Wonder Woman, Flash, Green Lantern, etc. would also be important. There might also be some villains that are central to the story, such as Lex Luthor who could be plotting against the newly - formed alliance of Batman and the Justice League.
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.
Obviously Batman himself is extremely popular. He's the main focus after all. But Superman also features prominently as his counterpart and sometimes rival. Wonder Woman is also a favorite as she often has interesting interactions with Batman, whether it's in combat or in strategic planning within the fanfiction stories.
Lex Luthor could be a likely villain. He's always devising plans to take down the Justice League, and this time he might have come up with a scheme that almost succeeds, until Batman steps in. For instance, he could create a super - weapon that targets the unique powers of each Justice League member.
Well, in batman and the justice league fanfiction, aside from Batman himself, The Flash is often a popular character to focus on. His super - speed can create all kinds of exciting plot twists, like being able to travel through time or dodge attacks in ways that seem impossible. Green Lantern is also great to write about. His power ring and the whole Green Lantern Corps lore can be delved into deeply. And of course, Aquaman, with his underwater kingdom and unique abilities related to the sea, can bring a whole new dimension to the fanfiction.
Batman himself is extremely popular. His dark and brooding nature, along with his incredible intellect and combat skills, make him a central figure. Superman is also a common choice. His god - like powers and moral compass add a lot of depth to the stories. Wonder Woman is another popular character. Her strength, both physical and in terms of her beliefs, can be explored in many different ways within the fanfiction.
Superman is also a top pick. His superhuman powers and his moral compass often contrast with Batman's more grounded approach. A fanfiction could focus on their friendship or the occasional disagreements between them within the context of the Justice League.
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.
Darkseid is another possible villain. He is extremely powerful. He could send his minions to attack the Justice League first, weakening them, and then use some sort of magic or technology to trap them. Batman would then have to find a way to free the League from Darkseid's clutches, perhaps by finding a weakness in Darkseid's power source.