Well, in such a fanfiction, Naruto as a monster could be a result of an experiment gone wrong in a crossover world. His transformation might make him an outcast even among his own village. He would have to struggle with his new identity. His monstrous form could attract other evil forces that want to use his power for their own malicious purposes, while Naruto, deep down, still has his good heart fighting against the monster within.
The story could progress with Naruto being shunned by those he once called friends. He might then be on a journey to find a way to reverse his transformation. Along the way, he could encounter other characters from different universes who either help or hinder his quest.
Well, if Naruto becomes the Kyuubi in the fanfiction, he would likely have an overwhelming amount of power. He might be able to defeat his enemies with ease. But he would also face the struggle of controlling such a powerful and wild force inside him. Maybe his friends would be both in awe and a bit scared of him at first.
Well, if Naruto becomes a homunculus in fanfiction, he might gain some unique alchemical powers. He could have enhanced physical abilities like super strength and speed, similar to what homunculi typically possess in the original concept. His ninja skills would probably merge with these new powers in interesting ways.
Well, in such a fanfiction, Naruto would likely lose all his skills and knowledge as a ninja. He'd be completely dependent on others for care, like eating baby food and being diaper - changed. Maybe his friends would have to protect him from the enemies who might see this as an opportunity to get rid of him once and for all.
Well, if Naruto becomes the reaper in fanfiction, he would probably have a whole new set of powers. He could start reaping souls in the Naruto universe, which would be a huge change. Maybe he'd use his new reaper abilities to deal with the more dangerous enemies in a different way, like sending their souls to some sort of afterlife realm.
If Naruto becomes an Arrancar in a fanfiction, he would likely gain new and powerful abilities. Arrancars have unique Hollow powers, so Naruto might be able to use Cero or other Hollow - based attacks. His physical abilities could also be enhanced, and his appearance would change to something more like an Arrancar. He might struggle with the more evil tendencies that come with being an Arrancar at first, but being Naruto, he would probably find a way to use these new powers for good and protect his friends and the village in a different way.
Well, if Naruto becomes Mikoto, he would be a female in the body of Mikoto. He could bring his own values and experiences as Naruto. This could potentially change the relationship dynamics within the Uchiha clan. He may try to bridge the gap between the Uchiha and the rest of the village in a way that Mikoto might not have been able to do in the original story due to her own limitations and the circumstances of the time.
If Naruto becomes the Flash in fanfiction, he would be incredibly fast. He could use his new speed to outmaneuver his enemies in combat. For example, in battles against the Akatsuki, he could zip around and strike them before they even realize it. His Rasengan might also be enhanced as he could deliver it with the speed of the Flash, making it even more powerful and difficult to dodge.
In this kind of fanfiction, Naruto might gain even more incredible power. He could have enhanced physical abilities like super strength and speed, as well as new jutsu related to the bijuu's nature. For example, if he becomes the Nine - Tails bijuu, he might be able to use the Tailed Beast Ball more effectively and on a larger scale. His appearance might also change, perhaps taking on some of the characteristics of the bijuu, like fox - like features if it's the Nine - Tails. This could lead to new relationships and dynamics with other characters. His friends might be in awe of his new power, while his enemies would be even more fearful.
In the 'naruto becomes a dad' fanfiction, Naruto would be passing on his values to his children. He'd be a role model for them. There could be storylines where he has to deal with his kids getting into trouble at the ninja academy. He might also struggle with giving them enough time while still being there for the village. It could show a more mature and responsible side of Naruto as he navigates fatherhood.