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.
Sakura could be another main character. She might be shocked by Naruto's arrest and start her own investigation. Maybe she teams up with Sasuke, who also has his own complex feelings towards Naruto. Their combined efforts could play an important role in uncovering the truth.
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.
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.
Perhaps in the fanfiction, Naruto enters a spiritual realm where Minato exists. There, they have a long - awaited heart - to - heart talk. Minato reveals secrets about the Uzumaki clan and Naruto's heritage. They then make a pact to protect the village and Naruto leaves the realm with new - found knowledge and determination.
It could be that Batman is arrested due to a misunderstanding within the Justice League. They suspect him of going too far in his methods, and while he is under arrest, Gotham is targeted by an old enemy. Batman has to convince his fellow heroes of his innocence from behind bars and also find a way to stop the threat to his city.
There might be a fanfiction where Naruto discovers some hidden secrets about Minato through a special jutsu. For example, he could find out about Minato's unfulfilled dreams and then strive to achieve them in his father's name. It would add an emotional depth to their relationship within the story.
Perhaps in this fanfiction, Naruto turns to the darker side of the ninja world. Since he lacks the love and guidance from Minato and Kushina, he might be more easily influenced by Orochimaru or other villains. He could start to believe that power is the only way to get respect and recognition, and thus embark on a path that is different from his canon self. He might also form unexpected alliances with characters who are also outcasts in the shinobi society.
A really cool plot might be that Kakashi time travels and discovers a hidden conspiracy in the past that was related to Team Minato. He then has to work with his past comrades, including Minato, to uncover the truth and prevent a great disaster that he knew about from his own time.
One interesting storyline could be Minato teaching Naruto some of his signature jutsu from a young age. For example, Minato could start showing Naruto how to form the Rasengan at a much earlier stage in his life. This would not only strengthen their bond but also make Naruto a more formidable ninja earlier on.