One way it could work is by having a magical portal open between the Harry Potter universe and Shao Kahn's realm. Harry and his friends could be accidentally transported there. Then they'd have to use their magic to survive in a world full of Outworld's warriors. Maybe they'd teach some of the magic to the good - hearted people in Outworld and in return learn some of their combat skills.
It could be that Shao Kahn somehow gets a hold of a powerful magical artifact from the Harry Potter world. This artifact gives him new powers and he starts to cause chaos in both universes. Harry Potter and his allies then have to team up with some of the heroes from Mortal Kombat to stop Shao Kahn. They'd need to combine spells and fighting skills to take on this powerful foe.
It could work if the characters from both universes were to cross over. Imagine Harry Potter and his friends joining the Mobile Infantry. Harry's leadership skills and his ability to think on his feet, which he developed while fighting against Voldemort, could be very useful in the battles against the bugs. Hermione's vast knowledge of magic could be applied to find new ways to combat the alien threat. Ron's loyalty and courage would also be valuable assets. The different cultures of the two universes would also create interesting clashes and collaborations.
Well, if we consider the crossover in a fanfiction, Tate could be a dark force in the Harry Potter universe. He could be influenced by Voldemort's ideology. However, his own complex personality might make him a more nuanced villain compared to the typical Death Eaters. He might have his own motives for causing chaos in the wizarding world.
Well, perhaps the lawyer character could be a Muggle - born in the Harry Potter world who is a huge Avengers fan. They somehow end up in a situation where they have to use their lawyering skills to represent the Avengers against some sort of magical - technological threat that combines elements from both universes. They might argue about who has the right to certain magical artifacts that are now in the hands of tech - savvy villains.
Naruto could adapt by using his strong willpower. He has faced many challenges in his own world, so he would rely on that experience. He might start by learning about Shao Kahn's powers and the politics of Outworld. His ability to make friends quickly could also help him. He could form alliances with some of the more reasonable characters in Outworld who were previously afraid of Shao Kahn.
A really interesting plot twist could be that Harry Potter turns out to be related to Shao Kahn in some way. Maybe there was a long - lost connection between the wizarding families in the Potterverse and Shao Kahn's bloodline. This would completely change how everyone views Harry and his role in both worlds.
Well, it could be a time - travel fanfic. Harry Potter and his friends travel back in time and meet Queen Elizabeth. They could help her deal with some threats to the throne using magic, and in return, she offers them something valuable in the wizarding world, like a special magical artifact that has been lost in the Muggle world for centuries.
Well, in this fanfiction idea, Naruto becoming Shao Kahn would be a wild transformation. Naruto is used to his world of ninjas and elemental jutsus, while Shao Kahn rules a dark and brutal realm. Maybe Naruto gets trapped in Shao Kahn's body due to a sorcerer's spell gone wrong. At first, he would be completely out of his element, but his adaptable nature would kick in. He would try to understand Shao Kahn's power and use it for good, like trying to end the constant bloodshed in Outworld and bring some peace, while also having to deal with the enemies that Shao Kahn has made over the years.
The concept of a Harry Potter and Sith Empire fanfiction is really exciting. We could see Harry Potter characters being trained in the ways of the Sith. Imagine Harry being tempted by the power of the dark side. He already has a connection to a powerful form of magic, and the Sith could see great potential in him. On the other hand, the Sith might face challenges in the wizarding world. For instance, the protective spells around Hogwarts could be a major obstacle for them. And the Ministry of Magic might initially not understand the threat of the Sith until it's too late.
The plot could involve Naruto being trained in the ways of Outworld combat in addition to his ninja training. Since Shao Kahn is a powerful and feared ruler, Naruto might be expected to be a great warrior. There could be a conflict where Naruto has to choose between the values he learned in his ninja village and the more brutal values of Outworld. For example, he may have to decide whether to follow Shao Kahn's orders to conquer other realms or stay true to his own sense of justice.
Obviously, Shao Kahn would be the main antagonist. He is a powerful and tyrannical ruler in his own realm. His thirst for power and domination would put him directly at odds with Naruto, who values freedom and justice. Shao Kahn's brutal methods of ruling and his desire to expand his empire would make him a formidable foe for Naruto.