It could be that the main antagonist is an evil wizard who has put a curse on McDonald's that makes all the food go bad. The Hamburglar and Ronald McDonald have to journey to find the antidote. At first, they don't get along because of their different natures. But as they face difficulties on their quest, they learn to rely on each other and overcome the wizard's curse.
One possible plot could be that the Hamburglar is reformed and Ronald McDonald helps him find a new purpose in the McDonald's world. Maybe they team up to create a new burger special together.
I'm not sure specifically. You could try searching on fanfiction websites like Archive of Our Own or FanFiction.net. There might be some unique crossovers there.
Maybe Goku is on a quest to find the most delicious food in the universe and ends up at McDonald's where he meets Ronald McDonald. They could team up to create a super - delicious meal that gives Goku extra power.
Yes, there are. Some versions might focus on him being a haunted figure, like his spirit being trapped in an abandoned McDonald's. Others could be about him being a creation of some dark magic that has gone wrong. Each version adds its own unique twist to the scariness.
Well, one thing could be his distorted appearance in some versions of the story. His usual friendly clown look is twisted into something menacing. His big smile becomes a creepy leer, and his bright colors seem to take on a more sinister tone, making it really scary.
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.