The fanfiction could be about Naruto's struggle to adjust to a normal life after being Hokage. He might feel a bit lost without the constant stream of paperwork and decision - making. So, he starts to explore his hobbies, like fishing. Meanwhile, he still has to deal with some remnants of old enemies who are trying to take advantage of his retirement, and he has to use his skills and influence in a different way to protect Konoha.
One possible plot could be Naruto dealing with the boredom of retirement. He might try to find new hobbies like gardening in Konoha. Maybe he starts teaching some young ninja in an unofficial way, passing on his unique skills and experiences.
It could be some of the old enemies who were thought to be defeated but managed to come back. For example, Orochimaru's former followers who still hold a grudge against Naruto and Konoha. They might see Naruto's retirement as an opportunity to strike.
Perhaps an old organization that was thought to be defeated resurfaces. They were biding their time while Naruto was hokage, and now that he's retired, they believe they can carry out their evil plans. They could be a group with a long - standing vendetta against Konoha and Naruto specifically. They might have new members or new powers that Naruto and his friends have to figure out how to counter.
Maybe Naruto has always idolized the Hokage in secret. He could be studying the ways of past Hokages on his own, trying to learn their leadership skills and jutsu. For example, he might be secretly practicing Minato's Flying Thunder God Technique because he admires his father so much.
One possible plot could be Naruto retiring from the ANBU due to the toll it has taken on his mental and physical health. He might then focus on mentoring the next generation of ninja in Konoha, sharing his unique skills and experiences.
You can try looking on popular fanfiction websites like FanFiction.net or Archive of Our Own (AO3). These platforms usually have a wide range of Naruto fanfictions, and there's a good chance you'll find 'Naruto the Retired Hokage' there.
One interesting aspect could be seeing new character developments. For example, how the retired Hokage interacts with the new generation in ways not shown in the original series. It might also explore different power dynamics and relationships within the Naruto universe.
In a fanfiction, if Naruto and Itachi were both involved in the Hokage scenario, Itachi could be resurrected through some means and Naruto, already a respected figure in the village, would propose Itachi as a candidate for Hokage. Itachi would initially be hesitant but Naruto's persuasion and the villagers' need for a different kind of leadership would make him accept. His time as Hokage would involve him training a new generation of shinobi in not just combat but also in understanding the importance of sacrifice and loyalty, with Naruto as his right - hand man, guiding him on how to interact with the more jovial and carefree side of the village life.
Well, in a 'Hokage Naruto guards Hogwarts' fanfiction, perhaps Naruto is brought to Hogwarts because Voldemort's return has created a need for a different kind of protector. Naruto, with his experience fighting powerful foes in his own world, could start by assessing the security of Hogwarts. He'd be amazed by the magic there, but soon adapt and use his chakra - based abilities along with some Hogwarts magic he picks up to keep the school safe. For example, he could use his Rasengan to fend off Dementors, as it's a powerful and concentrated form of energy.
One idea could be that the Sixth Hokage has to deal with a new threat from a long - forgotten clan. This clan has a special jutsu that can disrupt the chakra flow in the village. The Sixth Hokage then has to find a way to counter this jutsu, perhaps by seeking help from an old hermit who knows about ancient chakra techniques.