The main character is Naruto without a doubt. Regarding his family, it might not just be his biological family. In some fanfics, the concept of family can be extended. So, the Hidden Leaf Village as a whole, which Naruto considers his family in a way, could be involved. Maybe the village elders or other important figures act in a way that Naruto perceives as his family 'breaking' him. So, they could also be considered main characters in this context.
Obviously Naruto would be one of the main characters as the title implies that he is the one being broken by his family. His family members, whether it's his father Minato, mother Kushina, or other relatives in the Uzumaki clan, would also be main characters as they are the ones causing Naruto's distress.
Well, Naruto is the central figure for sure. In addition to his immediate family, there could be other characters who get involved in this family drama. For instance, his friends like Sasuke or Sakura might witness Naruto's downfall due to his family issues. They could play important roles, either trying to help Naruto or being powerless to stop his family from breaking him. Another character could be Iruka sensei, who has always been like a family figure to Naruto. His reaction to Naruto's family - caused problems could also be a part of the story.
Obviously Naruto himself would be a main character. His family members, such as his father Minato and mother Kushina, if they are part of the family issues in the fanfiction, would also be key characters.
Obviously, Naruto would be one of the main characters. He brings his ninja skills, his strong will, and his unique personality. And from the Rias family, Rias herself would be a main character. She has her own leadership within the family and her devil powers. Also, her peerage members could also be important characters as they interact with Naruto.
The main characters would surely include Naruto. Since he's the one returning to his world. His friends from the village, like Shikamaru who is smart and could be involved in strategizing when Naruto comes back. And Hinata, as she has a special relationship with Naruto. Also, villains or antagonists that Naruto has to face or reconcile with could also be important characters in the fanfic.
Well, obviously Naruto himself would be the main character. There could also be his friends like Sasuke and Sakura, who might be involved in the interactions between the two Narutos. Maybe they are confused at first by seeing two Narutos, but then they help them figure out what's going on.
Naruto is the central figure in this 'naruto imprisoned by his family fanfiction'. His family, including Minato and Kushina, are likely to be directly involved in his imprisonment. However, other characters from the Naruto universe might also play a role. For instance, Jiraiya could be a character who tries to find out why Naruto has been imprisoned and works towards his release. Also, Sasuke might get wind of Naruto's situation and decide to take action, either to help or because he sees it as an opportunity to gain an advantage.
It could still be Naruto himself. Since he's the central character in the original series, many fanfics would likely continue to build on his story.
Naruto is definitely one of the main characters. He is the key figure in the Naruto universe. His family, which includes Hinata, Boruto, and Himawari, are also likely to be main characters. Boruto, with his own dreams and potential, might be facing some internal or external conflicts. Himawari, being the younger one, could be used to show the family's protective side. And of course, other characters from the original series like Sasuke might also make appearances, as he is Naruto's best friend and they have a deep connection.
Since it's a fan - made concept, the main characters could be some of the less - known characters from the Naruto universe who get a chance to shine in this broken - universe scenario. For example, Rock Lee could be a key figure, using his unique taijutsu skills to navigate the chaos. Or perhaps some of the older generation like Kakashi could be guiding the younger ones through the mess.
The main characters could also include some of the more powerful or unique characters from each series. In Harry Potter, Dumbledore with his great wisdom and magical power might play a key role. He could be the one trying to figure out how to deal with the Twilight - related elements in this crossover. In Twilight, the Volturi, with their control over the vampire world, could be main characters. Their actions and decisions would likely have a big impact on the story as they interact with the wizards. Additionally, characters like Jacob from Twilight, with his werewolf nature, would add an interesting element when interacting with the werewolves in Harry Potter (if any are included in the fanfic).
Obviously, Harry is one of the main characters. His family members could include his parents, if they are alive in the fanfic's universe, or his siblings perhaps. There might also be his significant other, if he has one in the story.