Another plot might involve Naruto's friends and how they react to his married status. For example, they could be teasing him or helping him out in his new married life. There could also be some comical situations like his friends trying to give him relationship advice but it ends up being more of a mess.
Perhaps in the fanfiction, Naruto's marriage is part of a political alliance. So he has to deal with the political implications while also nurturing his relationship with his spouse. This could lead to a lot of drama and conflict, as he tries to keep both aspects of his life in harmony and also protect his village from any threats that might come as a result of his marriage.
Perhaps in the 'naruto returns stronger fanfiction', Naruto returns with enhanced physical abilities. He could have trained in a special place that increased his strength, speed, and stamina exponentially. For example, he might have found a way to tap into a new source of chakra that is much more powerful than the normal one. This would make his attacks more devastating and his defenses impenetrable.
One interesting plot could be them navigating their new married life while still being involved in the shinobi world. They might have to balance their duties and their relationship, like when Naruto has to go on long missions and Sasuke has to deal with his own investigations. They'll learn to communicate better in this new situation.
A common plot could be Tsunade being initially hesitant about the relationship. She might think Naruto is too young or that she is too old for him. But Naruto's charm and his ability to see past her age eventually convince her. For example, Naruto might take her on a journey to relive some of her happiest memories from her youth, which makes her see him in a new light and leads to their marriage.
A really interesting plot could be that Naruto is banished due to political reasons in Konoha. He's married to Ino (just as an example). Then, through some sort of magic or strange occurrence related to the crossover element, they are transported to a world full of magic users. Naruto has to learn how to use magic while still holding on to his ninja skills. His marriage to Ino is both a source of strength and a challenge as they face the new and often dangerous situations in this foreign land.
One interesting plot could be how Naruto manages the different personalities in his harem. For example, dealing with a strong - willed kunoichi who might clash with a more gentle - natured girl in the harem. Another plot could be the challenges they face as a married group, like how they handle family traditions from different clans.
One interesting plot could be Mal facing her old friends who have changed in her absence. Maybe they're now involved in different schemes on the isle, and Mal has to navigate through those complex relationships while also dealing with her own growth and new values from Auradon.
One possible plot could be that Edward returns to Bella after a long self - discovery journey. He realizes that his love for her is unwavering. Another might be that he comes back to protect Bella from a new and dangerous threat in Forks.
Another plot could involve Maria's return and her interaction with Bella. This could add a new layer of tension in Bella's relationship with the Cullens. Maria might see Bella as a threat or an opportunity, depending on how the story is crafted.
One possible plot could be Sasuke returning to Sakura after a long and dangerous mission. He realizes how much he has missed her and they start to rebuild their relationship. They might go on dates and do simple things like having dinner together or taking walks in the village.
One interesting plot could be Charizard reuniting with its original trainer after a long separation. It might involve a heartwarming moment where they recognize each other and then go on an adventure to face a new powerful enemy together.