I'm sorry I don't know the exact main characters in it. But usually in a sequel, the main characters from the first part would likely still be central, like the hero and the heroine if it's a love - based story.
Since I'm not familiar with '365 days part 3 story', I can't be certain about the main characters. But considering the nature of the series, the main characters are probably a couple. They could be from different backgrounds, which adds to the allure and the conflict in their relationship. The male character might be a powerful and wealthy man, while the female character could be someone with her own charm and independence, and together they create a story full of passion, love, and maybe some turmoil.
I'm not familiar with the '91 days story' specifically, so I can't name the main characters. However, they might be individuals with different personalities and goals. There could be a protagonist who drives the story forward, and perhaps some supporting characters like friends, family, or colleagues who interact with the main character during the 91 days.
There are several main characters in the '19 days story'. For example, Jian Yi and Zhan Zheng Xi are among the important ones.
In 'Kagerou Days Story', one of the main characters is Shintaro. He is a NEET type of character at the start but his life changes drastically. Kido is another key character. She is strong - willed and her power is significant in the group. Kano is a rather mysterious character. His actions and true nature are slowly revealed throughout the story. And Marry, she has a unique connection to the strange events in the story. All these characters together create the rich tapestry of the 'Kagerou Days Story'.
I don't know the main characters in the 'nero days story' without more information.
Without reading the '365 days sequel story', it's difficult to say who the main characters are. But if it's a sequel, chances are it will feature the main characters from the previous story, perhaps with some new characters added to spice things up.
Without reading the story, it's impossible to accurately name the main characters. However, common character types in stories with a waiting theme could include a lonely individual waiting for connection, or a person in a desperate situation waiting for help. It could also be a group of people waiting for a common event to occur, and within that group, there might be a leader - type character who is more vocal about the wait or more affected by it.
In the '10 days in a madhouse story', there could be a journalist who goes undercover in the madhouse as a main character. They would be the one observing and experiencing the ten days. Also, there may be some prominent patients who have unique personalities or backstories that play a significant role in the story.
The main character is a race car driver. There are also his team members like his mechanic and his crew chief who play important roles.
Since I don't know the story, I can't tell you the main characters. They could be ordinary people trying to survive the 15 days of darkness.