One idea could be that the fused Naruto and Sasuke form has a new set of unique jutsus that combine their individual abilities, like a Rasengan with Sasuke's Chidori lightning. Another could be that their fused form has to face an enemy that neither of them could defeat alone, such as a powerful Otsutsuki clan member. Also, the fusion might struggle with the different personalities of Naruto and Sasuke, leading to some internal conflict and character development.
A possible plot for the 'naruto and sasuke fuse fanfic' could be that the fusion is accidental and happens during a battle against a common foe. The fused Naruto - Sasuke then has to quickly learn to control their new power. They might discover that they can access Sage Mode and Sharingan simultaneously. This new form could also attract the attention of other villages, who either see it as a threat or a potential ally. As they journey, they start to understand each other on a deeper level than ever before, which changes their relationship in interesting ways.
One idea could be that Naruto and Sasuke find a mysterious baby in the forest. They then have to figure out where the baby came from and how to take care of it together. This could lead to some comical moments as they struggle with diaper changing and feeding.
A really interesting plot could be that Sasuke, for some mysterious reason, is the only one who can understand baby Naruto's unique needs. Maybe Naruto has some sort of power that only Sasuke can detect as a baby. So Sasuke becomes Naruto's guardian and mentor right from the start. As Naruto grows, they form an unbreakable bond that is different from their relationship in the original series. This could lead to many new adventures and challenges for both of them, and also change the way the other characters in the Naruto world view their relationship.
Perhaps Naruto, being smart, figures out a way to train with Sasuke in a new and unique way. They combine their skills in a way that no one has thought of before, leading to them both becoming even stronger and also deepening their bond. This could involve Naruto using his intelligence to analyze Sasuke's fighting style and find complementary techniques.
One plot idea could be that as a girl, Sasuke is more open about her emotions from the start. She might form a different kind of bond with Naruto, perhaps a more sisterly or friendly bond initially. Another could be that she faces different challenges in the ninja world because of her gender. For example, some might underestimate her skills at first.
One plot idea could be that chibi Sasuke, with his precocious nature, looks up to older Naruto who has become a respected ninja in the village. Sasuke could be constantly trying to prove himself to Naruto, leading to various comical and heartwarming adventures as Naruto mentors him in a way.
One interesting plot idea could be that in a world where Sasuke is a wolf and Naruto is a fox, they are forced to team up against a common enemy that threatens their respective clans. They start off distrusting each other but as they face challenges together, they learn to rely on one another's unique abilities.
One plot idea could be Sasuke and Sai being forced to team up on a mission. Sai, with his unique artistic abilities and Sasuke with his powerful jutsu. They start off not getting along as Sasuke is still brooding and Sai doesn't quite understand his ways. But as the mission progresses, they learn to trust each other. For example, Sai could use his ink techniques to create diversions while Sasuke attacks the real enemies from the shadows. This would show their growth as characters and how they can work together despite their differences.
One plot idea could be that they discover their brotherhood early on and train together more closely. They might combine their unique abilities, like Naruto's Rasengan and Sasuke's Chidori, to create new and powerful jutsus. This could change the whole dynamic of the story, with them facing challenges as a united front instead of rivals.
One idea could be a story where Naruto, as a mediator, tries to bridge the gap between Sasuke, representing Indra, and someone who has the spirit of Ashura. Maybe they have to work together to stop a new, powerful threat that only their combined powers can defeat. For example, a dark force that is trying to break the cycle of reincarnation between Indra and Ashura.
Perhaps Sasuke is mistaken for an enemy at first. His strange powers and appearance raise suspicion. But as the story progresses, it's discovered that he has knowledge of a greater threat that is coming to the RWBY world, something that might be related to his own past experiences. So he teams up with the RWBY characters to prepare for this threat.