Their relationship could develop through mentorship. Naruto, being older, could offer guidance to Sasuke. Sasuke would look up to Naruto as a strong and experienced ninja.
At first, Sasuke might be a bit jealous of Naruto's strength and popularity. But as they spend more time together, he would see Naruto's kindness and start to trust him. Naruto, on the other hand, would be patient with Sasuke and gradually break down his walls. They could develop a brotherly bond over time, with Naruto always there to support Sasuke in his growth as a ninja and as a person.
It might start with Naruto rescuing Sasuke from a dangerous situation. Sasuke would be in awe of Naruto's power. From there, Naruto would start teaching Sasuke some of his unique jutsu. As Sasuke learns, he would also learn about Naruto's values. Their relationship would be a mix of student - teacher and friends, with Sasuke coming to respect Naruto deeply and Naruto seeing Sasuke as someone with great potential that he wants to help reach his full capabilities.
Their relationship could deepen a great deal. Away from the village, they have only each other to rely on. This would make them more open and honest with one another. For example, Sasuke might finally share all his innermost thoughts and feelings about his family and his revenge plans with Naruto.
If Sasuke raised Naruto, Naruto would become very attuned to Sasuke's emotions. Sasuke is not one to show his feelings easily, but Naruto, growing up under him, would learn to read his every mood. Their relationship would also be influenced by the outside world. The other ninja clans might view this relationship with suspicion. However, Naruto and Sasuke would be united in facing any challenges, with Naruto learning from Sasuke's combat skills and Sasuke learning about compassion from Naruto.
A fanfiction could also be set in a scenario where older Sasuke and young Naruto are accidentally sent to a different dimension. In this strange new world, they have to rely on each other to survive. Sasuke's calm and calculated nature combined with Naruto's boundless energy and optimism would make for an interesting dynamic. They'd have to find a way to get back home while also dealing with the unique challenges of this new dimension.
Their relationship could become more competitive. Since ANBU is a place for elite ninjas, they might constantly strive to outdo each other in missions.
Their relationship could start as a rivalry. Fem Sasuke seeing Naruto with the Rinnegan as a new challenge to overcome. But as they face challenges together, they start to respect each other. Eventually, they could become friends and allies, relying on each other's strengths in battles.
At first, Yugao might see Naruto as just another rowdy young ninja. But as she gets to know him better, she realizes his potential. Naruto would be in awe of Yugao's skills. They could start training together, and through that, a bond of friendship forms. As time passes, they might become like siblings, looking out for each other and having each other's backs in difficult situations.
It could start with a chance encounter. For example, at a festival in Konoha. Hinata is there with her friends and Sasuke is just passing by. Their eyes meet briefly, and there's a spark of something new. Later, they are paired up for a training exercise. Hinata's unique fighting style impresses Sasuke, and he gives her some tips. Hinata is shy but also grateful. Over time, they start to communicate more, sharing their thoughts about the future of the village, and from there, their relationship blossoms.
Their relationship could develop in a complex way. Naruto, being the more outgoing fox, might be constantly trying to get Sasuke to open up. Sasuke, on the other hand, is reserved as a wolf. But over time, through shared experiences like exploring a mysterious part of their territory, they become closer and form a bond that is unbreakable.
At first, it would be rocky. Sasuke is often brooding and has his own agenda. Naruto would be the one trying to bridge the gap between them, while Gaara, having known loneliness, would be more open to the idea of having brothers. As time goes on, they'd start to trust each other more. Sasuke might see Naruto and Gaara as true comrades and family, especially when they fight side by side against strong opponents.
Their relationship would likely be full of tension at first. Naruto would be the one trying to reach out to Sasuke, while Sasuke would be more guarded. But as they face the challenges within Akatsuki together, they would slowly start to trust each other again.