A possible plot is that the evil Hokage has been corrupted by power. They start to impose extremely harsh rules on the villagers. Any form of dissent is brutally punished. They also might be using the village's resources for their own hedonistic desires, like building huge palaces for themselves while the common villagers suffer from poverty and lack of basic necessities.
Well, in some 'naruto is hokage fanfiction', there might be a plot where Naruto discovers a long - lost secret about the Hokage position. Maybe it's a hidden power that only the true Hokage can unlock. And then there could be a story line where Naruto has to balance his family life with his duties as Hokage. His kids might get involved in some dangerous situations that he has to handle while still leading the village.
One interesting plot could be exploring the Second Hokage's early days as a ninja. Maybe showing his training under the First Hokage and how he developed his unique water - style jutsu. Another could be a story where he has to face a powerful enemy from another village alone, testing his skills and strategic thinking. And also, a plot about his relationships with other important characters in the Hidden Leaf at that time, like how he influenced the future generations of ninjas.
Another plot might involve Naruto's relationships as Hokage. He could be mentoring a new generation of ninjas, like teaching them the true meaning of being a ninja. His own experiences as an outcast turned hero could shape his mentorship style. Also, his relationships with his old friends might change as he takes on the responsibilities of the Hokage, adding an interesting dynamic to the story.
Even Naruto himself could be a subject of this 'evil Hokage' concept in fanfiction. Maybe he is possessed by some dark entity or has a major change of heart due to some extreme event. This would completely change his character and turn him into an evil Hokage, which would be a very interesting and unexpected twist.
Well, perhaps a plot where the harem members in the 'evil naruto harem fanfiction' have to deal with the consequences of being associated with an evil Naruto. They might face opposition from the regular Naruto's friends and have to fight to protect their relationship with him. It could also involve the harem members trying to change Naruto from his evil ways, leading to some really emotional and tense moments.
Perhaps an evil Kushina could be jealous of the attention Naruto gets from others in the village. So she starts to plot against him, creating all sorts of false accusations and challenges for Naruto. Naruto then has to not only prove his innocence but also try to figure out what made his mother turn evil and if there's a way to save her.
One interesting plot could be Naruto facing new and unexpected challenges as Hokage. For example, a hidden threat from an ancient clan that resurfaces. Another could be Naruto's struggle to balance his family life with his duties as Hokage. He might have to deal with his son's rebellious phase while also handling village affairs.
One interesting plot could be that Evil Naruto uses his Mangekyou Sharingan to manipulate the memories of the villagers. He makes them believe false things about their past and present, causing chaos in the village. For example, he could make them think that their friends are enemies, turning the village against itself.
There might be a 'Naruto 7 Hokage fanfiction' where Naruto has to deal with internal political unrest in the village. Some of the clans might be unhappy with his decisions as the Hokage, and he has to use his diplomatic skills, which he has developed over the years, to resolve the issues and keep the village united.
Another type of fanfiction could focus on the relationships of the 5th Hokage. Maybe a story where she has to balance her duties as Hokage with her personal relationships. For instance, her friendship with other ninja might be put to the test when a decision she makes as Hokage affects them directly. This could explore the more human side of the character and how she copes with the pressures of leadership in the context of her personal life.