Who would be the main antagonist in a Cloud x Terra fanfic?

It could be a corrupted Keyblade master. This master was once good but was swayed by the power of darkness. He sees Ventus, Terra, and Aqua as threats to his new - found power. So, he tries to stop them from reuniting and using their combined strength to oppose him.

Perhaps Mister Sinister. He has always been interested in mutants like Wolverine and could see Deadpool as a useful pawn or a nuisance in his grand schemes. He might try to manipulate the situation to his advantage, causing Deadpool and Wolverine to join forces against him.

It could be a powerful, corrupted Pokemon trainer who wants to capture Cosmog and use its unique powers for his own evil purposes. He might see Cosmog as a key to unlocking ultimate power and doesn't care about the harm it could cause to Cosmog or the Pokemon world. He could also be in league with some dark - type Pokemon that can create obstacles for Marshadow and Cosmog.

Mr. Burns could potentially be the antagonist. He might see the combination of Spongebob and Homer as a threat to his power in Springfield. He could try to separate them and cause trouble for them. Maybe he wants to take over Bikini Bottom as well, seeing it as a new source of resources or power. He starts by spreading rumors about Spongebob and Homer in both their hometowns to turn the locals against them.

It could be Darth Sidious. Since he is always looking for power and control in the Star Wars universe, he might see Naruto as a threat to his plans when Naruto arrives in Padme's world. He would try to eliminate Naruto and use Padme as a pawn in his political games.

It could be Ra's al Ghul. He's always interested in things that can give him an edge in his quest for immortality. If he discovers the power of chakra in the Naruto world, he might try to take over both worlds. His skills as a master assassin and his vast resources would pose a huge threat to Naruto and Batman, who would have to put aside their differences to defeat him.

It could be a power - hungry ninja from within the Hidden Cloud Village who sees Raikage's relationship with Hinata as a threat to his own plans for taking over the village. He might try to spread false rumors about Hinata being a spy to turn the villagers against her and the Raikage.

A powerful dark ninja who has made a pact with some dark force from another dimension. He sees Gabriel as an intruder and Naruto as a threat to his plans of taking over the ninja world. He would use his dark jutsu and the power from the other dimension to oppose Naruto and Gabriel, and would stop at nothing to achieve his goals.

It could be Orochimaru from Naruto's world who has found a way to cross into the DC universe. He teams up with some of Batman's villains like the Joker. Orochimaru wants to use the chaos in Gotham to conduct his dark experiments and the Joker just wants to cause mayhem. Batgirl and Naruto would have to deal with Orochimaru's snake - like attacks and the Joker's unpredictable madness.

It could be a powerful ninja from Naruto's world who wants to use Nobunaga's knowledge for evil purposes. This ninja might see Nobunaga as a means to gain more power and control over the ninja clans. He could try to manipulate Nobunaga into starting wars between the clans by using his strategic mind in the wrong way.