Well, Naruto's immortality would give him an edge in the X - Men universe. His ninja skills like shadow clones could be used in really creative ways during battles. For example, he could send out clones to distract enemies while the real Naruto sneaks up on them. Also, his chakra powers might be seen as a new form of energy in the X - Men world, and some mutants might be curious or even afraid of it.
If Naruto were in the X - Men fanfiction, his immortality would mean he has a lot of time to learn about the mutants and their powers. He could potentially form alliances with certain X - Men. His ability to use Rasengan and other jutsus would be a great asset. Maybe he could teach some of the X - Men his ninja techniques in return for learning about their mutant powers. His immortality also means he can withstand more damage than most, so he could take on powerful mutants without much fear of dying.
In an X - Men fanfiction with an immortal Naruto, his powers would bring a whole new dynamic. Naruto's immortality might make some mutants jealous, as they often face the threat of death. His chakra control could be used to heal himself and others, which could be useful in the X - Men's fight against evil. He could also use his Sage Mode, which gives him enhanced senses and strength. This would make him a formidable ally or a tough opponent in the X - Men universe. His experience from his own world combined with his immortality would make him a very interesting character in this crossover.
Naruto would be a very unique addition to the X - Men universe. His godlike powers would make him stand out among the mutants. He could use his speed and strength, similar to some of the more powerful mutants like Wolverine or Colossus. But his ninjutsu would be completely new to the X - Men. He could teach them about stealth and deception, which are important ninja skills. Also, his strong sense of loyalty and friendship would fit well with the X - Men's values of acceptance and teamwork.
If the X - Men were in the Frozen universe, they would bring a new dynamic. Wolverine's healing factor would make him a valuable asset in the cold and dangerous environment. He could withstand extreme cold and any injuries that might come from the ice. Storm could collaborate with Elsa to create more elaborate weather patterns. The X - Men's mutant status could also cause some interesting reactions among the people of Arendelle, who are not used to such extraordinary abilities. It could lead to a story about acceptance and cooperation between two very different groups.
One possible plot could be that Naruto, being immortal, has seen many things in his long life. He comes to the X - Men universe with a different perspective. He might initially be seen as a threat because of his unknown powers. As the story progresses, he could prove himself useful by helping the X - Men in a big crisis. His immortality would allow him to take risks that others can't, and this could lead to some very exciting storylines. For example, he could sacrifice himself in a way that he knows he'll come back, to save the X - Men from a powerful enemy. This would earn him their trust and he could then start to explore the mysteries of the mutant world further.
Sasuke's Sharingan could potentially give him an edge in reading mutant opponents' movements. For example, if he was facing a fast - moving mutant like Quicksilver, the Sharingan might allow him to anticipate his actions. His ninjutsu skills could also be a unique addition. He could create illusions to deceive mutants with mental powers. In return, mutants like Jean Grey with her telekinesis could help Sasuke in battles by providing cover or moving objects to his advantage.
Sasuke and Magneto. Both are complex characters with a bit of a dark side. They could either become enemies as their goals might clash. Sasuke is on a journey to gain power for revenge, and Magneto wants to protect mutants but sometimes uses extreme methods. Or they could form an unlikely alliance, learning from each other's determination and power - seeking motives.
The powers of the X - Men would have a huge impact. For instance, Jean Grey's telekinetic and telepathic powers. She could easily manipulate the minds of the lords and ladies, making them vote or act in a certain way. This would completely disrupt the normal political intrigue and power plays that are based on alliances and manipulation through words and gold. It could lead to a new form of rule where those with the most powerful mutants are in control.
Beast Boy's power to transform into animals could complement Storm's weather - controlling abilities in many ways. For example, if they are in a battle and Storm creates a powerful windstorm, Beast Boy could transform into a bird and ride the winds to gain a strategic advantage. Or if they are in a desert environment, Beast Boy could turn into a camel while Storm creates a rain cloud to bring water.
Beast Boy's power to transform into animals could be affected by Storm's weather control. For example, if Storm creates a strong wind, it could either help Beast Boy fly faster in his bird form or make it difficult for him to stay in the air if he's not used to such strong winds. Also, if Beast Boy turns into a cold - climate animal like a polar bear, Storm could make the area around him even colder, enhancing his natural abilities in that form.
Well, Naruto could be like Cyclops. They both have a strong sense of leadership. Naruto's Rasengan could be similar to Cyclops' optic blast in terms of being a powerful offensive move. And Sasuke could be like Wolverine. He has that brooding, lone - wolf type of personality and his Sharingan could be like Wolverine's healing factor in that it gives him an edge in combat.
Naruto's chakra - based powers and Killer Frost's ice powers could create some interesting combinations. For example, Naruto could use his Rasengan and combine it with Killer Frost's ice to create an ice - encased Rasengan that could be more powerful and have a freezing effect on opponents.