Sunset Shimmer's powers might be a bit different from the typical mutant powers in the X - Men world. But that's what makes it interesting for a fanfiction. She could potentially be a bridge between the magical and mutant worlds. For example, if there are threats that involve both magic and mutant - hating forces, she could use her skills to unite the X - Men with other magical beings. Her power of teleportation, which she has in her own story, could be enhanced in the X - Men fanfiction and used to quickly move the X - Men around during missions.
It's a complex plot twist. In a particular storyline, she was exposed to a powerful energy field that disrupted her mutant abilities, causing her to lose the spikes.
In an X - Men fanfiction with an immortal Naruto, his powers would blend in an interesting way. Naruto's immortality might be seen as a super - power in the X - Men world. His ability to constantly regenerate and not die could be a mystery to the mutants. His other powers, such as being able to control the Nine - Tails' chakra, would add another layer of complexity. He could use the Nine - Tails' power to match up against some of the strongest mutants. And his experience as a ninja from his own world could bring a new perspective to the X - Men's way of handling threats.
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.
In the 'Scott Loses His Glasses' X - Men fanfic, it could be that he has to rely on his other senses more. Maybe he teams up with a mutant who has enhanced senses to help him get around. And this could lead to a whole new adventure where they face some common enemies. Also, without his glasses, his appearance might change in the eyes of his friends or foes, which could bring about some interesting interactions.
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.