A great plotline could involve Naruto not being alone in his quest. He might team up with some unexpected allies, like some of the former enemies who have now changed their ways. This would show the power of forgiveness and redemption in the story, as they all work towards bringing Sasuke back.
In some 'naruto retrieves sasuke fanfic', there could be a plot where Sasuke himself is in a moral dilemma. He might not be fully against being retrieved, but his pride and his own goals are holding him back, adding an interesting layer to Naruto's mission.
A crucial element is the conflict. There's the obvious external conflict of having to fight Sasuke's pursuers or those who want to stop Naruto. But there's also internal conflict within Naruto. He may doubt himself, or struggle with his feelings towards Sasuke. This internal conflict can drive the story forward and make the character more relatable.
Obviously, Naruto and Sasuke are the main characters. Naruto is the one on the mission to retrieve Sasuke, so he will be at the forefront of the story.
A possible plotline is that Sasuke is being held captive in a different dimension. Naruto has to find a way to enter this dimension. He meets some strange creatures there who can either help or hinder his mission. Naruto uses his skills and wits to overcome the obstacles. Once he finds Sasuke, Sasuke is initially resistant to coming back. Naruto then has to convince him by reminding him of their dreams when they were kids, like changing the shinobi world for the better. Naruto's unwavering belief in Sasuke eventually breaks through Sasuke's defenses and they return together.
Well, a cool plotline could be Boruto having to deal with the combined enemies of his father and Sasuke. Enemies from Naruto's past might target Boruto to get revenge on Naruto, and at the same time, there could be remnants of Sasuke's old foes as well. Also, in the fanfic, it would be interesting to see how Boruto's training is different. Maybe he has both Naruto and Sasuke as his mentors, and they constantly bicker about the best training methods, which adds a bit of humor to the story.
One interesting plotline could be Naruto and Sasuke going on a journey together outside of the Hidden Leaf Village to explore a new land filled with strange creatures and unique ninja techniques. They could face challenges that force them to rely on their friendship more than ever.
Some fanfics might have a plot where Sasuke and Sakura get transported to an alternate universe. In this universe, they are not ninjas but ordinary people. This forces them to rely on each other in different ways and they discover new aspects of their personalities and their relationship.
One possible plotline could be a comical situation where Sasuke is exasperated with Naruto's silly behavior and decides to 'spank' him as a form of discipline in a very light - hearted and friendly way. It could be part of their banter and growth as friends.
In a fanfic with a female Sasuke, the plotline might include her using her femininity as a strength in the ninja world. She could be more in tune with nature - based jutsu, for instance, and use that to her advantage. Her journey could also involve breaking gender barriers in the Hidden Leaf Village. She might be the first female to attempt certain high - level ninja training or missions. And her relationships with other characters like Sakura could be more complex, with a mix of competition and sisterly support as they both strive to be great ninjas in their own ways.
One possible plotline could be that Naruto has to go through a series of dangerous trials in the enemy's territory to reach Sasuke. He might face powerful foes and have to use new jutsu he's developed. Another plotline could be that Sasuke is in a coma, and Naruto uses his chakra to somehow enter Sasuke's mind and fight off the inner demons that are keeping Sasuke trapped. Maybe Naruto also has to convince Sasuke's friends from his time away to help him in this rescue mission.
One interesting plotline could be Naruto and Sasuke initially resisting the forced marriage but then gradually realizing they have a deeper connection they never noticed before. They might start to understand each other's pain and dreams better through this unexpected situation.