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.
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.
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.
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.
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.
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.
There might be his loyal servants as main characters too. They would be constantly trying to get the king to do his duties, creating a lot of comical situations.
Ahsoka Tano is a main character in some side stories. She was Anakin Skywalker's apprentice. Her story shows her growth from a young padawan to a powerful force - user on her own.
Maybe there are characters like a young woman who is lured by the idea of a wealthy man offering a life of luxury in exchange for her affection. And then there could be the man who sees love as a conquest and something he can obtain through his wealth. There might also be side characters like friends or family who react to these 'love for sale' relationships, either supporting or opposing them.