Who could be the main antagonist in a 'naruto in team 10 fanfiction'?

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 Danzo. He's always been a bit of a shadowy figure in the Naruto series. Maybe he sees Naruto as a threat to his power and influence in the village and manipulates the situation so that Team 7 has to abandon him. He would be a great main antagonist as he has the resources and the motives to cause such a rift in Team 7.

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.

Danzo could also be the main antagonist. He is known for his underhanded methods and distrust of anyone with too much power. Since Naruto has the power of the Nine - Tails, Danzo might spread lies within Team 7 to make them think Naruto is a danger, causing them to betray him.

There could be a group of bandits who have been causing trouble around the areas where Naruto is training Team 8. They don't like the idea of a strong team emerging in their territory. So, they start attacking the team during their training sessions. These bandits might have some crude but effective combat techniques and they also use the terrain to their advantage, which makes them a formidable antagonist for Team 8 during their training with Naruto.

It could be a rogue ninja from another village who has a vendetta against Konoha. This ninja might target Team 10 specifically because of Naruto's presence, seeing it as an opportunity to make a name for themselves by taking on a powerful shinobi like Naruto.

It could be a former member of Akatsuki who has a personal vendetta against Naruto. Maybe they escaped from prison and now they want to take revenge on Naruto for all the things he did to Akatsuki. They would be a very powerful and dangerous antagonist as they possess knowledge of many dark jutsus.

The villagers themselves could be the antagonists in a sense. They have always been somewhat afraid and resentful of Naruto because of the Nine - Tails. Their constant negative attitude towards Naruto could influence the decision to kick him out of Team 7. They might pressure the village elders and Kakashi into believing that Naruto is not a suitable member for the team and that he poses a threat to the safety of the other team members.

It could be Orochimaru. He might see the baby versions of Team 7 as perfect subjects for his experiments. He could try to kidnap them to use their unique chakra or potential for his own dark purposes.

It could be a rogue ninja from a neighboring village who is trying to steal some of Konoha's secrets. This ninja might target Konohamaru team because they are young and seem like an easy target, but they underestimate their skills and the protection they have from Naruto.