Not having read '340 days side stories', I can't tell you exactly who the main characters are. But generally, the main characters are the ones the story focuses on. They could be ordinary people put into extraordinary situations during those 340 days, or they could be individuals with a particular mission or goal. Their actions and decisions would then shape the side stories within the 340 - day timeframe.
I don't know the '340 days side stories' well enough to name the main characters. But usually in a story, the main characters are the ones driving the plot forward, so they could be the ones facing the most significant challenges or having the most growth during the 340 days.
Since I'm not familiar with this '340 days side stories', it's difficult to determine the main characters. However, in many stories, the main characters are often those with unique personalities or special abilities. They might be the ones who interact with a large number of other characters and are central to the various side stories that make up the overall narrative.
Since it's side stories related to 'nijiiro days', the main characters could be those boys who are the focus in the original. They might be the ones with different personalities, like the more outgoing one, the shy one, etc. These characters' stories in the side stories could show different aspects of their personalities and how they interact with each other in new situations.
Since I don't know the exact content of '340 days side stories', it's hard to say precisely. However, it might include things like daily life experiences of the characters during those 340 days. It could be about their joys, sorrows, and how they face different challenges. For example, they could be dealing with family issues, work - related problems, or making new friends.
I'm not entirely sure without reading it, but they might be related to the main characters from 'Rainbow Days'. It could be friends, family members, or even characters who had minor roles in the original but get more spotlight in the side story.
Typically, in a side story of a known series like 'nijiiro days', we can expect the main characters from the original to be present. So it might be those characters who were central to the main plot, such as the friends who had various relationships and adventures in the main 'nijiiro days' story. But again, without having read the side story, this is just speculation.
It's likely about the side stories related to 'nijiiro days'. Maybe it delves deeper into the characters' backstories, their relationships that weren't fully explored in the main story, or events that happened off - the - main - plot. For example, it could show more about the characters' daily lives, their hobbies, and how they interact with each other in different situations.
It might be an old storyteller who is the central figure. He knows all the tales of the east side, from its founding to the present day. He passes on these stories to the younger generation, keeping the history and culture alive.
There are Tony, a guy with a past in the Jets. Then there's Maria, a young and passionate girl who is related to the Sharks through her brother Bernardo. Also, Riff, who is a key figure in the Jets and helps drive the conflict between the two gangs. These characters play crucial roles in the story, with Tony and Maria's love story at the center and Riff fueling the gang - related tensions.
Maybe there are characters like a strong - willed female lead who is trying to break free from the constraints of her family's traditions (blood) while falling in love with someone from a different world. And a male lead who has his own secrets related to his family and is drawn to the female lead's independent spirit. In this kind of scenario, these two would be the main characters in 'blood and love side stories'.
In the 'book of fire side stories', the main characters could be quite diverse. One could be a storyteller himself, who travels from place to place sharing his tales and in the process becomes a part of the stories. There might be a group of children who discover a magical doorway in an old attic and they are the main characters as they explore the strange new world on the other side. Also, there could be an old hermit who lives in the mountains and holds the key to a great mystery that other characters are trying to solve.
Chainsaw Man himself is likely to be one of the main characters in the side stories. Also, characters like Power or Aki might play significant roles. Since they are important in the main story, it's reasonable to assume they'll be involved in the side stories as well.