Most likely Naruto would be one of the main characters since it's in the title. And since it's about a faulty seal, characters who are related to Naruto's situation in the original story might also be main characters, like Jiraiya. He was Naruto's teacher and knew a lot about the seals, so he would probably play an important role in this fanfiction.
Definitely Naruto, as the story seems to revolve around him and his faulty seal. Another important character could be Tsunade. As the Hokage, she has a responsibility to the village and Naruto's situation with the faulty seal could pose a threat to the village. So, she might be involved in trying to fix the seal or at least manage the consequences. Additionally, Kurama (the Nine - Tails) could be a main character in a different way. Since the seal is faulty, Kurama might be able to interact with Naruto more or influence him differently than in the original story.
Well, Naruto for sure. Then, there could be Sasuke. Even though he's not directly related to Naruto's seal in the original story, in a fanfiction, the faulty seal on Naruto could have an impact on their relationship. Maybe Sasuke becomes more concerned or jealous of Naruto's new situation because of the faulty seal. Also, Kakashi could be a main character. He's Naruto's sensei and would be involved in helping Naruto deal with the issues arising from the faulty seal.
I'm not entirely sure as I haven't read this specific fanfiction. But generally, in Naruto fanfictions, 'the faulty seal' could imply something wrong with the seal on Naruto's body (like the Nine - Tails' seal). It might explore how this faulty seal affects Naruto's life, his powers, or his relationships with other characters in new and different ways compared to the original story.
There's no definite answer as it's fanfiction. However, it's likely that well - known characters like Naruto, Sakura, and Kakashi could be involved. Naruto because he's the protagonist of the original series and always looking for new ways to become stronger. Sakura could be involved in researching the medical implications of the seal if it has any. And Kakashi, with his vast knowledge, could be either helping or hindering the discovery and use of the resistance seal depending on the plot of the fanfiction.
Perhaps there is a wise old seal master who takes the prodigy under their wing. This character could have a lot of knowledge about the history and secrets of seals, and they would play an important role in the prodigy's growth. Additionally, there could be some antagonists, maybe a group of rogue ninjas who want to steal the prodigy's seal knowledge for their own evil plans.
There could be a rival character, a fellow ninja who is jealous of the seal master's skills with the Hiraishin. This rival might constantly try to undermine the seal master or steal their techniques, adding a layer of conflict to the story.
Often, the main character is the secret seal master themselves. They are usually highly skilled in the art of seals and have a deep understanding of the ninja world's secrets related to seals.
I don't know for sure, but I assume the main character would be the faulty apprentice. There might also be a mentor figure who is guiding or trying to correct the apprentice's ways.
Sasuke could also be a prominent character. His skills and knowledge, especially his Sharingan which can help in deciphering and breaking seals, make him a likely candidate. He may be driven by his own goals, such as seeking revenge or power, and seal - breaking could be a means to an end for him in these fan - created stories.
Obviously Naruto himself is a main character as the memory seal is related to him. Sasuke could also be involved, as he has a deep connection with Naruto and might notice the changes in him due to the seal.
Kakashi could play an important role. As Naruto's former teacher, he would surely want to help Naruto understand and control the Caged Bird Seal. He could use his knowledge and experience to guide Naruto. Another character could be Jiraiya. Even if he's not alive in the original story at a certain point, in the fanfiction, he might return as a spirit or something to give Naruto advice about the seal.
Well, the main character is likely to be the seal master. This person is probably highly skilled or on a journey to become highly skilled in the art of seals. There may also be other characters from the Naruto universe who interact with the seal master, like Naruto himself. Naruto could be a friend or a rival to the seal master, depending on how the story is written.