Kakashi Hatake is a popular choice. He has a long history with both Naruto and Sasuke, having trained them. He could be included to offer guidance or add some comedic moments. For example, he could give them some tough training exercises that help them bond more. Another popular character is Sakura Haruno. She has her own complex relationship with both Naruto and Sasuke. Her presence can add some drama, like if she has to choose between helping Naruto or Sasuke in a difficult situation.
Gaara of the Sand is also quite popular. He has a connection to Naruto through their shared experiences of being outcasts in a way. In a fanfiction, he could join Naruto and Sasuke on a mission. His unique sand - based powers and his calm yet powerful personality would contrast well with Naruto's exuberance and Sasuke's brooding nature. Hinata Hyuga could be another option. Her love for Naruto can add a romantic sub - plot, and her Byakugan abilities might be useful in a joint mission with Naruto and Sasuke.
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.
Sakura is often quite popular. In college fanfiction, she might be a brilliant medical student, still having her feelings for Sasuke while also becoming good friends with Naruto. Her strong - willed nature and intelligence can add a lot to the story.
I think Kakashi could be really popular. Since he has a connection to both Sasuke and Naruto, his role in a time - travel story could be very interesting. He might be able to help them adjust to the past or use their knowledge to his advantage. Another popular character could be Itachi. His actions in the past are so crucial to the story, and in a time - travel scenario, he could interact with Sasuke in a whole new way.
Their children are also very popular. Boruto and Sarada, for example. Fanfiction often explores their relationship as the children of two of the most important ninjas in the village. They might have a lot of pressure on them, and exploring how they deal with that while also having their own friendship or rivalry is great content.
Gaara is a character that can be well - written in this context. He has his own experiences with darkness and redemption. He might understand Naruto's possible fall into evil in a different way compared to others. He could offer his unique perspective to Sasuke on how to deal with Naruto. Also, Tsunade could be important. As the Hokage, she has to make difficult decisions regarding the threat that an evil Naruto poses to the village and how to support Sasuke in his efforts to stop Naruto without causing too much destruction.
Sakura could be an important character. In a Fem Sasuke and Naruto fanfiction, Sakura might be jealous of the relationship between Fem Sasuke and Naruto at first, but then she could grow to accept it and even become a good friend to Fem Sasuke. Kakashi is also a great addition. He could be the one to mentor Fem Sasuke and Naruto, teaching them new jutsus and guiding them on their ninja paths. Another character could be Gaara. He might be an ally or an opponent in the story. If he's an ally, he could team up with Fem Sasuke and Naruto to fight a common enemy. If he's an opponent, it would add an interesting dynamic to the story as they have to face off against his powerful sand abilities.
Kakashi is a great addition. He has a long history with both Naruto and Sasuke and can act as a mentor or a source of wisdom. Sakura can also be included. Her relationship with both Naruto and Sasuke adds depth to the story. She can be a strong female character who helps or challenges them. Shikamaru is another good one. His intelligence can bring new perspectives to the plot.
Kakashi would be a great addition. His wisdom and combat skills could add depth to the story. He could act as a mentor figure, guiding Naruto and Sasuke through the strange situations they find themselves in due to the fox - related elements.
Kakashi is often a popular character. He has a lot of knowledge and skills, and his presence can add an interesting dynamic. He might be the one to discover Naruto and Sasuke's time - traveling secret and help them navigate the changes they're trying to make. Another one could be Sakura. She might be involved in different ways, like trying to figure out why Naruto and Sasuke are acting so differently due to their time - traveling knowledge.
One popular plot twist could be that Naruto and Sasuke are forced to work together in a different way than in the original story due to some strange magic in the fanfiction. Maybe they have to switch powers for a while. Another could be that they discover a long - lost relative who changes their relationship dynamics. And a third might be that they are transported to a completely different dimension where they have to rely on each other more than ever to get back home.