One possible plot could be Naruto using the bunker as a secret training ground. He could practice new jutsus without being disturbed, and perhaps discover some hidden power within the bunker. Maybe there are ancient markings or seals in the bunker that he deciphers, leading to a new level of strength.
If Naruto lives in a bunker in fanfiction, it could also be a place of self - discovery. Away from the hustle and bustle of the village, he has time to reflect on his past and his role as a ninja. He might find old scrolls in the bunker that tell stories of forgotten ninja arts. Naruto could then try to revive these arts and incorporate them into his own fighting style. This could lead to him becoming an even more formidable ninja when he finally emerges from the bunker.
His relationships with his friends in the village would likely become strained. Since he's living in a bunker, he's away from them. They might worry about him and feel left out. For example, Sasuke might think Naruto is avoiding him on purpose.
Well, one possibility could be that Naruto has to adapt to the different culture in Kumo. He might face challenges in making new friends as the people there have different values and ways of life compared to Konoha. He could also discover new jutsus unique to Kumo and incorporate them into his own fighting style.
Naruto might have a hard time adjusting to Gotham at first. But his positive attitude could inspire some of the gloomy citizens there. He could also form an interesting team with some of the local vigilantes, like Batman. His ability to sense emotions could help in dealing with the complex and often dark characters in Gotham.
Well, Naruto might find some ancient secrets in the bunker. Maybe it's filled with old ninja tools or scrolls that hold powerful jutsu. It could also be a hiding place for a villain he's been after, leading to an epic battle.
Perhaps in this fanfiction, Naruto lives in the sewers because he is hiding from some sort of threat in the village above. He might be wrongly accused of a crime he didn't commit. While in the sewers, he meets other outcasts or misfits who have also sought refuge there. Together, they form a sort of underground community. Naruto then tries to clear his name from the sewers, using the resources and the new friends he has made to gather evidence and prove his innocence.
Well, in a 'naruto lives in suna' fanfiction, perhaps Naruto is exiled from Konoha for some reason. He then finds a new home in Suna. He starts training with the Sand ninjas and discovers new aspects of his chakra control. He also gets involved in the internal politics of Suna, trying to bring peace between different factions within the village.
Maybe Naruto has to go undercover in this fanfiction. He could be hiding his identity to protect the village from a new, unseen threat. He might be living among the enemies without them realizing who he really is, using his skills in a more stealthy way compared to his usual open - style combat.
Well, perhaps Naruto is sent to a dimension where Eevees are the main inhabitants. He has to adapt to living with them. He could form strong bonds with individual Eevees, like an Eevee that's really brave and they go on adventures together, exploring the new land and facing challenges that are unique to this world of Eevees.
Well, perhaps in this fanfiction, Naruto goes to Kiri to escape some sort of danger in Konoha. Once in Kiri, he finds himself in the middle of the village's internal power struggles. He uses his skills and determination to try and bring peace to the village, while also dealing with the fact that he's an outsider. He might even start to train some of the younger ninjas in Kiri, sharing his unique ninja way.
In this fanfiction, Naruto could be in the temple because he is on a self - discovery journey. The temple might have a special connection to his family or the Sage of Six Paths. There, he could train his chakra control in a more serene environment, away from the hustle and bustle of the village. He may also encounter some sort of trial within the temple that tests his ninja way and makes him grow as a person and a ninja.