Well, Gojo could be a super powerful outsider. Maybe he comes to the Naruto world to study its unique chakra system. His Infinity ability would be a game - changer. He could use it to easily deflect most ninjutsu attacks. And his Six Eyes could help him detect hidden enemies or traps that normal shinobi might miss.
Well, in Naruto fanfiction, Goku and Vegeta might be introduced as legendary figures. Goku's kind - hearted and always - ready - to - fight nature could be seen as an inspiration to some of the younger Naruto characters. Vegeta's journey from a villain - like character to a more complex anti - hero in his own story could be mirrored in the Naruto universe. They could be brought in to help during a major crisis, like when the Akatsuki was at its peak, using their unique powers to turn the tide.
In fanfiction, Naruto could bring a new perspective to the Durmstrang curriculum. His unique ninja abilities could inspire the teachers to think about combat and power in a different way. He would need to learn about spells and incantations, which would be difficult for him. But his experience in training hard to master new techniques in the ninja world could help him in learning the Durmstrang curriculum. He could also introduce some of his own training methods to the students, like his way of building up stamina through intense physical exercises.
Another way Cerberus can fit into the Naruto world in fanfiction is as a spiritual guide. Maybe Naruto, during a near - death experience, enters a spiritual realm where he meets Cerberus. Cerberus then guides him on a journey to discover new powers within himself. This could be related to Naruto's connection with the nine - tailed fox and how Cerberus helps him better understand and control that power.
He might not fit in very well at first. Naruto is so used to the shinobi world. At Yancy Academy, his clothes and his headband would make him stand out. But his friendly nature could help him make friends eventually.
Well, Goku's extreme power level could make him a sort of legend in the Naruto fanfiction world. His Saiyan abilities like the Kamehameha and Super Saiyan forms would be completely foreign to the ninjas. He might be seen as an otherworldly being, and his presence could disrupt the power balance. Maybe he'd come to the Naruto world seeking a new challenge, or perhaps he was accidentally transported there.
Naruto would fit in by being the energetic and determined member. His loud and boisterous personality would contrast with some of the more reserved members of the Justice League. His physical abilities, like his superhuman strength and speed gained from his ninja training, would make him a valuable addition in battles.
Naruto could fit into Grayfia Peerage by bringing his combat skills. His taijutsu and ninjutsu would be valuable assets. For instance, his ability to quickly adapt in battle could help the peerage in tough situations.
One popular 'naruto is fit' fanfiction might be those where Naruto has been training extra hard and is in peak physical condition for a big mission. In these stories, he can outrun his opponents easily and his strength is on a whole new level.