The Akatsuki could also be antagonists in this fanfiction. They might see the Uzumaki bloodline as a threat or as a valuable asset to their goals. So they would target Naruto not just as a jinchuriki but also as the heir of the Uzumaki clan.
Perhaps an old enemy of the Uzumaki clan, long thought to be defeated, resurfaces. They see Naruto as a threat because of his position as the heir and aim to eliminate him before he can fully embrace his Uzumaki heritage and power. This could be someone with a vendetta against the Uzumaki for past events, like a clan that was defeated by the Uzumaki in the past and now wants revenge.
Well, it could focus on Naruto exploring his Uzumaki heritage more deeply. Maybe he discovers ancient Uzumaki jutsu or artifacts that give him new powers.
Well, it could be about Naruto exploring his Uzumaki heritage more deeply. Maybe he discovers some long - lost Uzumaki jutsu or secrets that help him in battles or in uniting the ninja world.
It could be a powerful ninja who is jealous of Naruto's new godly powers. He wants those powers for himself and will stop at nothing to get them.
Perhaps it's a group of ninja who see Naruto's newfound Lucifer - related power as a threat to the ninja world order. They might form a secret organization to oppose him. They could be from different villages and set aside their differences just to stop Naruto. They might believe that his power will bring chaos and destruction to the world of ninjas.
Gaara could be an important ally. He has always been Naruto's friend and as the Kazekage, he could provide resources and support for Naruto's plan to revive the Uzumaki clan. Maybe he could offer building materials to help rebuild Uzumaki settlements or send some of his shinobi to help with security during the revival process. Another possible ally is Tsunade. She is a Sannin and has a lot of knowledge and influence. She could help with medical research related to the Uzumaki clan, like finding ways to preserve their unique genetic traits or heal any potential genetic diseases within the clan. Also, she could use her political influence to get other villages to support Naruto's plan.
It could be a group of rogue ninja who are after the Uzumaki's powerful sealing jutsu. They see it as a way to gain unlimited power and rule the ninja world, so they target the Uzumaki clan, which makes Naruto their main enemy as he stands in their way.
Karui could be one of the characters. Since she is from the Hidden Cloud Village and has a connection to the Uzumaki clan through her son's relation to Naruto. Another could be Hinata. Although she is from the Hyuga clan, her love for Naruto and the Uzumaki influence on Naruto's life could bring her into the story. Also, Tsunade, as she has a connection to the Senju clan which is related to the Uzumaki clan.
It could be the elders of his clan. They are often the ones who make decisions in the clan, and if they see Naruto as a threat for whatever reason, they could be the main antagonists. They might be afraid of Naruto's growing power or his different way of thinking that could disrupt the traditional ways of the clan.
Obviously Naruto would be one of the main characters since it's about him being the heir to the Uzumaki. Sakura and Sasuke might also be important characters as they are Naruto's friends and comrades. There could also be some original characters created specifically for the fanfiction, like an old Uzumaki sage who guides Naruto on his journey as the heir.