Another possibility is an external force, like a neighboring village. They see Naruto and Yugito joining the new village as a threat to their own power. So, they send spies or launch small - scale attacks on the new village in an attempt to drive Naruto and Yugito away. They might also try to turn the new villagers against Naruto and Yugito by offering false promises or by spreading lies about their intentions.
The plot could involve Naruto and Yugito being on a mission near a small, unknown village. They end up getting involved in the village's problems, like fending off bandits or some other external threat. The villagers are so grateful that they offer them a place in the village. Naruto is excited about the new opportunity to make a difference in a new place, but Yugito is hesitant at first. As they start to adapt, they use their unique abilities from their previous villages to help the new village grow and develop, and along the way, they form new bonds with the villagers.
Orochimaru would likely be a main antagonist even if Naruto joins the Sound Village. Orochimaru has his own devious plans, and Naruto might not fully agree with them. Even though Naruto is in the village, Orochimaru could try to use Naruto for his own gain, like getting access to the Nine - Tails' power. So, Naruto would constantly be at odds with Orochimaru.
One possible main antagonist could be a group of rogue ninjas who are targeting Kumo. They see Naruto joining Kumo as an opportunity to cause chaos. They might try to frame Naruto for various crimes in Kumo to turn the villagers against him and Yugito, who is defending him. Another could be a power - hungry Kumo ninja who doesn't like the idea of an outsider like Naruto coming in and potentially getting more attention or power than they have.
Perhaps an old enemy of one of the members of Team 9 shows up. Since Naruto has joined the team, they might see it as an opportunity to get revenge. This antagonist could be someone who was once defeated by the member's family and now wants to prove themselves. They would be very cunning and use their knowledge of the team member's past to try and divide the team.
It could be an old enemy who has resurfaced, like Orochimaru again. Since Naruto and Sasuke are together now, Orochimaru might see them as a threat to his own plans for power and immortality.
One possible plot could be that Naruto, for some reason like seeking new training methods or to bridge the gap between Konoha and Kumo, decides to join Kumo. With Yugito there, they might start as strangers but gradually form a bond. Maybe Naruto's unique abilities and positive attitude start to change the way the people in Kumo view him. He could also learn some of Kumo's special jutsu while sharing his own knowledge, all while his relationship with Yugito deepens into a friendship or something more.
It could be the ninja from Naruto's former village who don't want him to succeed in his new place. They might see his new - found influence as a threat and try to undermine him.
It could be the leader of the dark guild. This person would likely have a very different ideology from Naruto's. Maybe the leader believes in using extreme and unethical means to gain power, like sacrificing innocent lives for dark magic. Naruto would constantly clash with this leader as he tries to uphold his own values.
Orochimaru could still be the main antagonist. Even if Naruto joins Team Hebi, Orochimaru's motives are often self - serving and evil. He might be using the team for his own experiments or to gain power, and Naruto would oppose that. Naruto's presence in the team could disrupt Orochimaru's plans, leading to a conflict between them.
It could be a rogue hunter nin who doesn't like the idea of Naruto, an outsider, joining their ranks. This rogue hunter nin might see Naruto as a threat to their power and influence within the group.