Who could be the main antagonist in a 'batman in wonderland fanfic'?

Ra's al Ghul would also be a great choice. His knowledge of the occult and his desire to cleanse the world in his own way could put him at odds with the power of the Witchblade. He might see it as a tool that could either be used for his own ends or something that needs to be destroyed to maintain his version of order in the world. Batman would be caught in the middle, trying to protect Gotham and the wielder of the Witchblade from Ra's al Ghul.

The Caterpillar could be the main antagonist. He has always been a bit of an enigma in Wonderland. Maybe as Alice shrinks, he sees her as a threat to his control over the small part of Wonderland he rules and tries to stop her from exploring further.

The Joker could be a great antagonist. His chaotic and unpredictable nature would contrast with Naruto's more straightforward sense of justice.

Ra's al Ghul could also serve as the main antagonist. He might have a new plan for Gotham that involves using Catwoman as a pawn. He could be aware of her relationship with Batman and try to use it to his advantage. Batman would have to not only save Gotham but also rescue Catwoman from Ra's al Ghul's clutches.

Maybe there's an Amazon who has turned against her sisters and sees Batman's arrival as an opportunity to gain power. She could try to use Batman's technology for her own evil plans, and Batman would be caught in the middle between her and the rest of the Amazons.

The Riddler could be a great main antagonist. He could use his knowledge of time paradoxes and puzzles to try and outwit Batman as he travels through time. He might set up elaborate traps across different time periods that Batman has to solve.

The Joker could also be a main antagonist in this fanfic. He could be interested in causing chaos not only in Gotham but also in the world of Wonder Woman. His unpredictable nature and love for mayhem would make him a formidable foe for the two heroes. He might come up with a plan that plays on their differences and tries to drive a wedge between them while also causing destruction.

One possible plot could be Batman being transported to Wonderland through some sort of magical portal. He then has to navigate the strange and topsy - turvy world of Wonderland while trying to find a way back home. Along the way, he might encounter the various zany characters like the Cheshire Cat, who could either help or hinder him with their cryptic advice.

The Batman Who Laughs could also serve as the main antagonist. He represents a twisted version of Batman, and his goal could be to infect all the Batverses with his madness. His knowledge of Batman's tactics and his own insanity would pose a huge challenge for the normal Batman as he tries to stop him from spreading chaos.

The Joker could be a likely main antagonist. He might be the one who manipulates the situation to get Batman arrested, perhaps by framing him for one of his own heinous crimes. The Joker loves to play mind games, and getting Batman locked up would be a huge part of that.