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.
One main conflict could be their different approaches to justice. Robin might be more impulsive and want to take quicker action, while Batman is more methodical. Another could be Robin trying to prove himself as an equal rather than just a sidekick, which could lead to clashes. Maybe there are also differences in how they view the use of certain tactics or their relationships with other characters in the Young Justice universe.
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.
There are three main characters really. Batman, he's the one who starts off seeing Superman as a danger. He has his gadgets and his detective skills. Superman, of course, he can fly, has super strength and heat vision. Then there's Lex Luthor. He's a very smart and manipulative character. He's the one who sets in motion the conflict between Batman and Superman through his various plots.
One possible storyline could be that Batman discovers a conspiracy within the Justice League that endangers Gotham. So he and Robin decide to take on the League to stop it. Another could be that the Justice League is being mind - controlled, and Batman and Robin are the only ones who realize it and try to free their friends by fighting them. Or perhaps there's a misunderstanding where the Justice League believes Batman and Robin have turned bad, and they have to fight to prove their innocence.
Well, in a battle between Batman and Robin vs the Justice League, it's really tough to say. Batman is known for his incredible strategic mind and vast array of gadgets. Robin, depending on which one, also has some skills. But the Justice League has some of the most powerful beings in the DC universe like Superman with his super strength, speed and heat vision, Wonder Woman with her combat skills and Amazonian powers. However, Batman has been known to take on foes much more powerful than him with his wits. So it could be a very close fight if Batman and Robin could use the right tactics.
A possible plot idea is that Batman discovers a dark secret within the Justice League that they are unaware of. This secret could be something that could potentially destroy the League or change their moral compass. Batman then has to decide whether to confront the League directly or try to fix the problem on his own, which causes the 'vs' situation as the League may see his actions as a threat.
It depends on the context. If it's a straight - up fight, the Justice League has superpowers that would seem to give them an edge. But Batman is known for his strategic mind. If he had time to prepare, he could potentially take down members one by one using their weaknesses. For example, using kryptonite against Superman.
One idea could be that Batman discovers a hidden agenda within the Justice League that he believes endangers the world, so he decides to oppose them. For example, he might find out that a new technology the League is using has unforeseen and dangerous side effects.
One interesting plot could be Batman's distrust of the Justice League's unrestrained power leading to a full - on confrontation. He might secretly plan to take down each member one by one, using his intellect and prep time. Another could be the Justice League being mind - controlled and Batman having to fight them to break the control.