The main characters would most likely be Naruto and Minato. But other characters like the other members of Team 7 - Sasuke and Sakura - could also be involved. Sasuke might be curious about Minato's return and how it could affect Naruto's power. Sakura, on the other hand, could be involved in any medical or support aspects related to Minato's return, especially if he comes back with some sort of injury or weakened state.
Obviously, Naruto and Namikaze Minato would be the main characters. Naruto as the protagonist of the original series and Minato as the returned figure.
Well, the main character is usually the Namikaze heir. They could be a new character created for the fanfiction, or sometimes it could be an existing Naruto character given the role of the heir. Naruto himself might also be a central figure as he has a connection to the Namikaze name.
The fanfiction could center around the emotional reunion between Naruto and his father. Minato might be brought back by some sort of ancient or forbidden jutsu. His return could also bring to light some long - hidden secrets about the Uzumaki and Namikaze clans. He could then work with Naruto to protect the village from threats both internal and external, and along the way, Naruto could learn more about his family's history and his own true potential.
Naruto himself is obviously a main character in most of these fanfictions. Since it's about the Namikaze bloodline and he's the son of Minato Namikaze.
Obviously Naruto would be one of the main characters. Since it's about the Namikaze clan restoration, he's the key figure as he is part of the clan. There might also be some of his friends like Sasuke who could support or oppose his efforts in different ways.
Naruto Uzumaki is often associated as he has ties to the Namikaze clan through his father. He could be a central character in exploring the Namikaze clan doujutsu, either as a potential wielder or someone trying to understand it. Another could be Minato Namikaze, Naruto's father. His own abilities and knowledge could be crucial in uncovering the secrets of the clan's doujutsu.
Obviously, Naruto and Tenten are the main characters. Naruto, the energetic and powerful ninja, and Tenten, the skilled weapon - using kunoichi.
Well, aside from Naruto, there could be characters like Kakashi Hatake. He was Naruto's mentor, and his reaction to Naruto's return would be interesting. Also, characters from other villages might play important roles. For example, Gaara from the Sand Village. His friendship with Naruto could be explored further in this fanfiction, especially in the context of Naruto's return and how it affects their relationship and the relationship between their respective villages.
Naruto Uzumaki, even though he's not strictly a Namikaze in the beginning of the story, is also a popular character in Namikaze clan fanfiction. Since he's Minato's son, a lot of fanfictions explore his connection to the clan. They might write about how he discovers more about his father's clan and how he uses their techniques and heritage to become even stronger.
Obviously, the Namikaze Clan Head would be a main character. His family members, like his wife and children if he has any, could also be important characters. And Naruto himself, since he is related to the Namikaze clan, could play a significant role, either as an ally or someone who challenges the clan head's decisions in some way.
In fanfiction, Kakashi Hatake can be an excellent character to pair with Minato and Naruto. Kakashi was Minato's student and Naruto's teacher at some point. His knowledge and skills can add depth to the story, and his relationships with both of them can create interesting interactions.