I'm not sure specifically as I don't know which 'As Time Goes By Story' you are referring to. It could be different depending on the story.
There is no definite answer without more context about the 'As Time Goes By Story'. It could have a wide range of main characters. For instance, it could be a family with different generations, and the story could focus on how they interact and how their relationships evolve as time passes. Or it could be a single individual and the people they meet throughout their life journey.
I'm not sure specifically as I haven't read this particular novel, but generally, there could be a protagonist who is likely to be the central figure through which the story unfolds. There might also be a love interest, someone who plays an important role in the protagonist's life and their journey as time passes.
In 'Desmond goes back in time fanfiction', Desmond is surely a main character. He could meet his own family members from the past, and they could be important characters too. For instance, his great - grandfather might be a key character. There could also be a love interest for Desmond in the past, a local girl perhaps, who adds an element of romance to the story and also influences his actions and decisions while he's in the past.
There could also be characters from the past that become central to the story. For example, if they go back to the time of the First Hokage, Hashirama Senju could be a major character. Team 7 might interact with him, learn from him, or even have to work with or against him depending on the plot of the fanfiction.
I'm not sure as the story isn't described in detail. But it could be an ordinary person, like a single mother trying to raise her kids while facing financial hardships, yet still managing to keep life going.
In the 'bono goes to school story', Bono is the central character. However, his parents could also be considered main characters in a sense. They are the ones who send him to school, and their influence on his school - going attitude and behavior might be part of the story. Also, any special friends he makes at school, like a best friend who he shares all his school secrets with, would be among the main characters as they contribute to the plot and Bono's experiences at school.
Since it's 'the lion goes to war story', the main character is most likely the lion itself.
Probably Franklin is the main character. And there might be his teachers and classmates as important characters too. His teachers would be involved in his learning process, and his classmates would be part of his social experience at school.
Froggy's classmates could also be main characters. In a school story, the interactions between Froggy and his classmates are usually important parts of the plot. They might study together, play together, and experience different things together, which makes them important characters in the Froggy Goes to School story.
Given the lack of information about the 'topanga goes black story', it's difficult to determine the main characters. However, if we assume that Topanga is the central figure, there might be characters associated with Topanga's life. It could be a love interest, a mentor, or even a rival. For example, if it's a coming - of - age story about Topanga, there could be a best friend who is with Topanga during the events that lead to the 'goes black' situation, or a parent figure who tries to help Topanga through it.
Pepper is surely one of the main characters as the story is about Pepper going to school.