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.
Tony and Maria are the main characters. Tony is a member of one group, and Maria is from the other. Their love forms the central part of the story.
In East Side Story, Tony stands out as a main character. He is a young man with his own dreams and desires. Maria, on the other hand, is a beautiful and passionate young woman. Their relationship drives a lot of the story. Bernardo, Maria's brother, is a strong - willed character. He represents the pride and protection of his group, and his actions often set off the main conflicts in the film.
Since I don't know the specific 'Squeeze East Side Story', I can't say for sure who the main characters are. But if 'Squeeze' is in the title, it could be that Squeeze is one of the main characters. Maybe there are also characters like local residents, business owners, or community leaders on the East Side who play important roles in the story.
There could be a protagonist who is caught between two worlds - the Eastern world he comes from and the Western world around him. Maybe there's also an older relative, like a grandparent, who serves as a link to the pure Eastern traditions. And there might be friends or neighbors who either support or challenge the main character's journey in dealing with the East - West divide.
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.
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.
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'.
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.
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.