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.
Boruto's character development could be a complex journey. At first, he may feel overshadowed by his parents' fame and power. This could lead to him acting out or trying to prove himself in the wrong ways. However, as he experiences more of the ninja world and faces challenges, he starts to understand the true meaning of his parents' actions. He might develop a more empathetic side, seeing things from the perspective of others, especially those affected by Naruto and Sasuke's past actions. He also grows in terms of his combat skills, learning from both his father's brute force and Sasuke's finesse. His character arc could be about finding his own identity within the context of his parents' great reputations.
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.
One interesting plotline could be exploring Naruto's early days of training with Jiraiya in more detail. Maybe showing his struggles and how he overcame them during that time.
One possible interesting plotline could be Naruto having to deal with the powers he inherits from Atlas in a world that already fears his Jinchuriki powers. He might struggle to balance the new abilities and the expectations that come with being related to a powerful figure like Atlas.
One interesting plotline could be Naruto's struggle with his new identity as the'son of chaos'. Maybe he has to deal with powers he doesn't fully understand at first. Another could be how the other characters in the Naruto universe react to this new revelation about Naruto.
One interesting plot could be Sasuke taking Boruto on a special training journey across different hidden villages. This would not only strengthen Boruto's skills but also give them a chance to bond like master and apprentice.
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.
One interesting plotline could be Naruto and Hinata going on a secret mission together in Boruto's time. They get to show off their teamwork skills that have only gotten better over the years.
Perhaps in the fanfic, Boruto uses the Nine - Tails' power to face a powerful new enemy that neither he nor the Hidden Leaf Village has ever encountered before. This could lead to intense battles and strategic thinking on Boruto's part.
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.