As the title suggests, the two main characters are likely to be the alpha and the rogue. The alpha is probably a strong, dominant character within a group or community. The rogue is someone who is outside the normal structure, perhaps an outcast or a loner.
The main characters in 'alpha mated to a rogue fanfic' would be the alpha, who might be a werewolf or a character with alpha - like qualities in a supernatural context. This character is likely to be powerful, with a sense of responsibility towards their group. The other main character is the rogue. The rogue could be a character who has been shunned by society or has chosen to live outside the normal rules. Their different backgrounds and personalities will drive the story as they interact and form a relationship.
I'm not sure specifically as there could be many different versions of such a fanfic. But generally, it might involve an alpha character, who is usually a dominant figure in a werewolf or some supernatural setting, forming a mating bond with a rogue, which is often an outcast or a character not following the normal pack or group rules. It could be about their journey of dealing with this unexpected bond, facing opposition from the alpha's pack perhaps, and how they grow together in the relationship.
The main characters are the female lead who gets mated to the alpha king and of course, the alpha king himself.
Since I haven't read it, I can't say for sure. But based on the title, the main characters are likely to be the one who is mated (presumably a female), the alpha of the pack, and his beta.
Without having read the 'alpha rogue novel', it's impossible to name the main characters accurately. However, based on the title, we can assume that the main character is the alpha rogue. There might also be characters who oppose him, like those from the more 'civilized' or 'orderly' part of the story's world. And there could be other rogues or outcasts who side with the alpha rogue, forming a sort of 'rogue group' within the story.
There could be a love interest in the story as well. This character would play an important role in the alpha rogue's life, perhaps softening their rough edges or causing them to reevaluate their goals. Maybe there's a wise elder character who offers guidance to the alpha rogue during difficult times.
Since I haven't read it, I can't say for sure. But likely, the main characters are the female lead who is 'blindly mated' and the 'bad boy alpha' himself.
Since I don't know the specific 'naruto the rogue fanfic', it's hard to say for sure. But it could feature Naruto himself as he might be involved in dealing with the rogue character. There might also be Sasuke, as he has his own complex relationship with the concept of being a rogue in the original series.
In some alpha indra fanfics, there could be antagonists as well. These could be powerful villains such as Zargon, who tries to stop alpha indra from achieving his goals and creates conflicts and obstacles for him throughout the story.
Sometimes there could be an older, wiser dog that acts as a mentor to the puppies. This character could offer advice and guidance to the alpha and omega puppies, especially when they face difficult situations like dealing with a predator or finding a new place to live.
Typically, the main characters would be the alpha pup and the omega pup. They are the central focus of the fanfic.