He might meet the future versions of Naruto and Sakura. Their relationship with him could be very different in the future, perhaps they are now leaders of the village and Sasuke has to adjust to their new status.
Sakura, without a doubt, is frequently paired with Sasuke in fanfiction. Her feelings for him in the Naruto series are well - known, and fanfic writers often build on that. In addition to her, some fanfictions might pair Sasuke with female characters from other ninja clans. These new pairings can bring fresh storylines. There are also some fanfictions that explore a relationship between Sasuke and a foreign princess or a powerful female ninja from a far - off land, creating a more exotic love story.
Sakura is a very popular character to include. She has a long - standing relationship with both Naruto and Sasuke. Her medical ninjutsu skills can be very useful in various plot situations. Kakashi is also popular. His experience and unique jutsu can add depth to the story. Another popular character is Shikamaru. His intelligence can be a great asset in devising strategies against enemies.
Naruto would be an interesting character to pair with Sasuke. Their long - standing relationship and the contrast between Naruto's positive energy and Sasuke's more brooding nature could create great drama in a crossover situation. Especially when Sasuke has the Rinnegan, Naruto might have to adjust his way of fighting and interacting with him.
It could be a powerful enemy like Orochimaru. Orochimaru was always interested in Sasuke's potential, but if the plot changes and Naruto gets bitten, Orochimaru might see Naruto as an equally interesting subject to experiment on.
Another possibility is that Hinata could be his love interest in an alternate version of the story. She is a kind - hearted and strong - willed character, and her gentle nature might be what attracts Sasuke in this 'love story'.
It could be Orochimaru. He has always been interested in Sasuke and might kidnap Sakura to use her as bait to get Sasuke back under his control. He could be after Sasuke's power and think that by using Sakura, he can manipulate Sasuke easily.
There could be a mysterious organization that has been hidden for a long time. They emerge when Sasuke and Sakura start their journey. This organization wants to use Sasuke's power and Sakura's medical knowledge for their own evil purposes. They set up traps and send assassins to target the duo throughout their journey.
There might be some ancient forces or entities that are awakened by Naruto and Sasuke's new 'godlike' status. These could be demons or spirits that were sealed long ago and now see Naruto and Sasuke as threats to their plans of domination. They would be very powerful and require Naruto and Sasuke to use all of their enhanced abilities to defeat.
Sakura and Sasuke are the main characters. Sakura, who has loved Sasuke for a long time and has grown into a very capable woman. Sasuke, who has returned to the village and is now part of a family. Their children also play important roles. For example, their daughter could inherit Sakura's medical skills and Sasuke's determination, making her a key character in the fanfiction.