A cool plot could be that Minato is brought back to the present for a short time. He gets to meet Naruto's friends and see the village he helped build in a new light. Naruto shows him all the new things in the village, like the new training facilities, and they bond over their shared love for the village and their family.
In this kind of fanfic, a possible plot is that Minato and Naruto get to spend some normal family time together. They could go fishing, like Naruto used to do with Iruka. During this time, they bond and Minato gets to understand the simple joys that Naruto has in life, which he might have missed out on if he were still alive in the normal Naruto storyline.
One interesting plot could be two Narutos from different timelines meeting. They could exchange stories about their battles and growth, and then team up to face a new, powerful enemy that neither could defeat alone.
Another plot could be that there is a power struggle in the village. Some people want to undermine Minato's leadership and use Naruto as a pawn. They set up a situation where Naruto appears to be a threat, and Minato is pressured into arresting him, but later Minato discovers the truth and has to fight against those who set Naruto up.
Well, in such a fanfic, there could be a training session where Minato teaches Naruto some of his signature jutsu. This would be a great opportunity for Naruto to learn more about his family's ninja techniques and heritage. It could also be a chance for Minato to see how strong his son has become.
One interesting plot could be Minato traveling back to prevent the Nine - Tails attack on Konoha. He could use his knowledge of future events to stop Orochimaru from influencing the situation that led to the attack. Another plot might be Minato traveling to a time when the Uchiha clan was on the verge of the coup. With his wisdom and power, he could try to find a peaceful solution and prevent the massacre. Also, he could travel to the time of the First Hokage to learn more about the origin of the ninja world and bring back that knowledge to improve Konoha in his own time.
One interesting plot could be Minato and Naruto going back in time and Minato getting to see Naruto grow up from the start. He could teach Naruto things he didn't get to in the original timeline, like more advanced jutsu. Another plot might involve them changing key events in the past that had a major impact on the future of the ninja world. For example, preventing certain tragedies or battles.
Another character that could be important is Jiraiya. Since he was Minato's teacher and Naruto's mentor, he could play a role in the fanfic. Maybe he helps facilitate the meeting between Minato and Naruto, or he has some words of wisdom for both of them during their time together.
In a 'Minato Meets Hokage Naruto' fanfic, it could start with Minato's sudden appearance in the village. He's confused at first but then realizes it's the future. Meeting Naruto, he sees the strong and confident Hokage. They might have a sparring session where Minato gets to see Naruto's new jutsu and fighting style. This could also lead to a heart - to - heart conversation about family, with Naruto sharing his memories of growing up without his father and Minato expressing his regrets and pride.
In this kind of fanfic, Naruto might get some early training from Minato. Maybe Minato could teach Naruto some of his signature jutsus, like the Rasengan, much earlier than in the original story.
Well, Naruto could have a chance to bond with his father on a deeper level. Maybe they'd share stories about their lives. Team Minato might be shocked to see how much Naruto has grown and the power he holds. Also, there could be some emotional moments when Naruto realizes what his father was really like. And they could all team up to fight a common enemy, showing off their combined skills and strategies.