The main character is probably the 19th wife. But depending on the nature of the story, there could be other important characters. For instance, if the story focuses on her family's reaction to her being the 19th wife, then her parents or siblings could be important characters. Or if there's a community aspect, community leaders or other influential people in the area where she lives could also be part of the story.
Since we don't know the full story, the main character is likely the 19th wife herself. There may also be her husband as an important character.
The 19th wife is surely a main character. There might be other wives too, who could play significant roles in the story, either as friends or rivals to the 19th wife. And of course, the husband who has multiple wives would also be a central figure in the story.
I'm not able to recall the main characters in the Decameron's 5th day 4th story precisely. However, in the Decameron, characters often include young lovers, wise elders, and cunning servants. It's possible that the 5th day 4th story also features such types of characters, who get involved in complex relationships and situations that drive the plot forward.
Since I haven't studied the 'decameron 5th day 9th story', we can only make some speculations. It may have a male protagonist who is on a quest for something, perhaps love or wealth. There might be a female character who is either an object of his affection or an obstacle in his path. And there could also be other supporting characters like friends or family members who influence the actions and decisions of the main characters.
Well, Jason Voorhees is the central and most prominent character in the 'Friday the 13th' story. He is the source of all the horror. There are also the camp counselors and campers. For example, in some of the movies, there are characters like Tommy Jarvis who try to fight back against Jason. These characters add to the story as they either become victims or try to put an end to Jason's reign of terror.
In the '10th love story', the main characters could be very diverse. It could be a story about an older man, let's call him Mr. Smith, who has lost his wife and then meets a young woman, Ms. Brown. Ms. Brown might be someone who has a passion for life and helps Mr. Smith rediscover the joys of living. There could also be other important characters like their friends or family members who either support or oppose their relationship, adding more drama to the story.
Maybe there is a teacher as one of the main characters. The teacher could play an important role in guiding the students in the story, like helping them with a difficult project or solving a conflict among the students.
The most obvious main character is the 7th man. But in a story, there are often other characters who interact with the main one. In this case, there could be comrades if he was in a group situation, or perhaps an antagonist who causes problems for him. There might also be a love interest, which could add an emotional layer to the story. Without reading the story in detail, it's hard to name all the main characters precisely, but the 7th man is surely at the center of it.
Since we don't know the details of the '7th man story', the main characters could be the 7th man himself and the people around him in the story.
I don't know as there's not enough information given. It could be students, teachers, or parents in the context of 7th - grade life.
It's hard to say without more context, but they could be two characters who are ranked 4th and 10th in a particular system. For example, in a school of magic, the 4th best student in one class and the 10th best in another class meet.
Maybe the main characters are a group of rebels from the 4th and the ruling class from the 12th. The rebels are fighting for change, and the ruling class is trying to maintain the status quo. Their meetings and clashes can create a lot of drama and conflict in the fanfiction.