One possible plot could be Minato and Kushina looking on with pride as Naruto marries Hinata. They might be reminiscing about their own relationship and how far Naruto has come. They could also be interacting with the other guests, sharing stories of Naruto's childhood that the others may not know.
In this fanfiction, Minato and Kushina could play a more active role in the wedding. Maybe they help Naruto get ready, giving him some last - minute advice about marriage. Kushina could be adjusting Hinata's veil or something like that. As the ceremony progresses, they watch with joy as Naruto and Hinata exchange vows. After the wedding, they might be part of the group that gives the newlyweds a grand send - off, with Minato using his teleportation jutsu to create some fun effects during the celebration.
Well, perhaps in the fanfiction, Minato and Kushina are a bit emotional. Minato is seen smiling broadly, while Kushina might be on the verge of crying happy tears. They could be having a private moment where they talk about how they always hoped Naruto would find true love. And then, they join in the wedding celebrations, dancing and having a great time with the other villagers who are also there to celebrate Naruto's big day.
Perhaps in this fanfiction, Minato and Kushina leave Naruto because they are cursed. They fear that the curse will harm Naruto if they stay close. So, they go into exile. As Naruto grows up, he starts to discover clues about his parents' real reason for leaving and sets out on a quest to find them and break the curse. This could lead to many adventures and character - development moments for Naruto.
One possible plot could be that Minato and Kushina are somehow brought back to life in a spiritual or semi - physical form. They then embark on a journey through the ninja world to find Naruto. Along the way, they encounter various characters who either help or hinder them. Maybe they have to face some old enemies who are still lurking in the shadows and trying to stop them from reuniting with Naruto.
One possibility could be that Naruto discovers a long - hidden secret about his family that makes him feel betrayed. For example, he might find out that Minato and Kushina had made a deal with a dangerous enemy in the past that put the village at risk. This would be so against Naruto's values of protecting the village and his friends that he decides to leave them.
Maybe in the fanfiction, there is a powerful enemy who wants to use Naruto's connection to his parents against him. So, they somehow manage to bring Minato and Kushina back to the physical world. When they meet Naruto, it's an emotional moment. They form a plan to defeat the enemy together. Minato uses his strategic skills, Kushina her strength, and Naruto his own unique abilities learned over the years.
There could be a plot twist where they are revived in a different time period. Maybe they are brought back during the era of the Sage of Six Paths. This would mean they have to adapt to a very different world with different rules and powers. Another plot twist could be that when they are revived, they are linked to an ancient evil. They have to fight this internal connection while also trying to figure out what has happened to the ninja world in their absence. Additionally, it could be that their revival was actually a test by the gods of the ninja world to see if they can bring about a new era of peace.
Minato could be using his charisma to engage with the older and more respected ninja at the wedding. He might be discussing village politics in a light - hearted way. Kushina, on the other hand, would be more involved with the family - friends. She could be hugging and laughing with them, and maybe even showing off some old pictures of Naruto when he was a baby. They would both ensure that the guests are having a great time.
It might be due to jealousy. If Minato was getting more attention or praise in the village for his achievements while Kushina felt overlooked, that could create resentment. Say, Minato was constantly being hailed as a hero for his speed and battle tactics, and Kushina, who also had great power, felt like she was in his shadow.
Perhaps they return to impart some final wisdom to Naruto. Minato could teach Naruto some advanced sealing techniques that he hadn't mastered yet, and Kushina could share more about the Uzumaki clan's secrets and how Naruto can further harness his Uzumaki heritage.
Well, perhaps in this fanfiction, Evil Minato and Kushina find Naruto when he is at a very vulnerable state. They see an opportunity to use him for their evil plans. Their plans might involve using Naruto's Jinchuriki power to open a portal to a dimension full of dark energy. But Naruto, being the resilient character he is, tries to resist them. He calls upon the memories of his friends and the village that has always supported him, and he gradually starts to turn the tables on his 'evil' parents.
It could be a matter of prophecy. Minato might have received some sort of prophecy that staying with Naruto and Kushina would lead to the destruction of the village. So, in a misguided attempt to save Konoha, he abandons them. Or, there could be a power struggle within the village that makes Minato believe that leaving Naruto and Kushina is the only way to keep the peace. However, these are all just speculations within the context of fanfiction.