In the 'naruto shunned by family fanfic', it's possible that the main antagonist is Naruto's own self - doubt, which is exacerbated by his family's shunning. He constantly battles with the feeling that he might be unworthy, and this internal struggle acts like an antagonist, holding him back from achieving his full potential. However, as the story progresses, he could overcome this self - doubt and rise above the family's rejection.
It could be a family member who has a personal vendetta against Naruto and is the main instigator of his being shunned. Maybe an older cousin who is jealous of Naruto's potential.
Perhaps the main antagonist is an outside force that has influenced the family's view of Naruto. For example, a powerful ninja from another village who spreads false rumors about Naruto to the family, causing them to shun him. This antagonist would be trying to undermine Naruto's growth and development, seeing him as a threat in the long run.
Besides Naruto, there might be a young girl named Hana. She could be from a family that was once friends with Naruto's family but now has mixed feelings about him. She's conflicted between her family's stance and her own sense of justice. And then there's Kenji, a strong - willed boy who was also shunned in a different way and he and Naruto form a bond based on their shared experiences.
It could be a rogue ninja who has a vendetta against Naruto and wants to target his family. Maybe this ninja was once defeated by Naruto and now wants to take revenge by harming his loved ones, especially his and Sakura's child.
Maybe the main antagonist is a member of Naruto's own family who is power - hungry. This family member sees Naruto's growth to the Jounin level as a threat to their own position within the family. So, they manipulate the rest of the family into forgetting Naruto and excluding him from the family unit. They would stop at nothing to keep Naruto away and maintain their own power and influence.
The Organization in the Claymore world could be the main antagonist. They already have a lot of secrets and do some morally ambiguous things. If Naruto shows up and starts changing the status quo, like teaching Claymore warriors to be more independent, the Organization might see him as a threat and try to eliminate him.
It could be a rogue ninja who was once a student of Orochimaru and has now developed his own dangerous jutsu. He wants to take over the ninja world and believes the old ways are holding everyone back.
Orochimaru could be a great antagonist. He might want to use Shenron's power for his own dark experiments. He could try to steal the dragon balls and manipulate the wishes to gain immortality or create an army of powerful, immortal ninja.
It could be someone who opposes Naruto's newfound admiration for Ganondorf. Maybe a traditionalist ninja who thinks Naruto is straying from the true ninja path by getting influenced by Ganondorf.
Lex Luthor could be a great antagonist. He's always looking for power and knowledge. If he discovers Naruto's abilities, he might try to use them for his own gain or see Naruto as a threat to his plans in Smallville.
It could be Orochimaru. He's always been interested in unique powers and abilities. The idea of X - 23's mutant abilities and Naruto's jinchuriki powers would be very appealing to him. He might try to capture them both to use in his experiments to gain ultimate power.
A new character could be created as the antagonist. For example, an Uchiha who has been corrupted by the power of the Sharingan and wants to use Naruto's special Uchiha - related abilities for his own evil purposes. This character could be jealous of Naruto's unique position within the Uchiha - related story and try to take it from him.