I don't know as the 'big brother novel' isn't clearly defined. But generally in a novel with a 'big brother' concept, there could be a protagonist who rebels against the 'big brother' figure or system.
Another possibility is that there could be a group of characters who form an underground resistance against 'big brother'. They might be the main focus, with each having their own backstories and reasons for fighting against the overarching control represented by 'big brother'.
I'm not sure as there's not much information given. But it could be the 'big brother' character himself as one of the main characters. There might also be characters who are related to him, like younger siblings or friends who interact closely with him.
Since I don't know the exact 'big brother story', it's hard to say. But generally, the main character would be the big brother himself. There might also be his younger siblings as important characters.
The big brother and the little brother are the main characters. The big brother could be a confident and responsible character, while the little brother might be more naive and in need of guidance. There could also be friends of the brothers in the story that interact with them, but the focus remains on the relationship between the two brothers.
Well, clearly Victoria is one of the main characters. Then there's the 'big brother', who could play a role like a protector or a guide in the story. And of course, the crow is also a main character. It might be an unusual character that brings something unique to the story, whether it's a source of conflict or an aid to Victoria and her big brother.
Well, obviously Naruto himself is a main character in these types of fanfictions. Often, his friends like Sasuke or Sakura can be part of the story too, as they interact with Naruto in his big - brother role. For instance, Sasuke might be a bit skeptical at first about Naruto's new role but then come to respect it.
Daniel Tiger and his big brother are the central figures. Daniel Tiger is a curious and kind little character, and his big brother is there to guide him, share experiences and tell him bedtime stories.
The main characters would be Jasper and Bella, as the title implies Jasper is Bella's big brother in this fanfiction.
I don't know the 'little big brother story' well, but I guess there would be the 'little big brother' character as the main one. There might also be other characters like his siblings or friends that he interacts with.
Obviously, Naruto himself is a common character as the big brother figure. Sasuke can also be a key character, perhaps as someone Naruto is trying to bring back into the fold or protect. Sakura might be there as a friend and fellow ninja who supports Naruto's big brotherly actions.
Big Brother could be an individual who has been observing and gathering information secretly for a long time. He might be an insider in a particular system, like an employee who has access to confidential information.