Since I'm not familiar with 'the extra passenger short story', it's hard to determine the main characters. But it's likely that there is at least one character whose perspective the story is mainly told from. This character might be an ordinary person who is thrown into an extraordinary situation because of the extra passenger. There could also be secondary characters who either support or oppose the actions of the main character in relation to the extra passenger.
Not having read it, I can only guess. There might be a protagonist among the regular passengers who has to deal with the extra passenger. There could also be a character who is initially hostile to the extra passenger, and another who is more sympathetic. Maybe there is an authority figure like a conductor or a ship captain if it's a story set in a vehicle or on a ship.
Well, without having read 'the extra passenger short story', it could be that the extra passenger is a mysterious figure. Maybe they bring a new perspective to the main characters. They could be a source of conflict, like if they have a different goal than the other passengers. Or perhaps they are a symbol of something, for example, a symbol of an unexpected change or a new opportunity that the characters have to face.
Given that it's a 'passenger short story', the main character is most likely the passenger. But there could also be supporting characters. For example, if the story is set on a ship, there could be a captain or a crew member who interacts with the passenger in a significant way. Or if it's a story about a plane journey, there could be a flight attendant who has an important role in the story. Without more details about the specific 'the passenger short story', it's hard to be certain about all the main characters.
Since I don't know the exact 'passenger to be free story', I can't say for sure. But it could be the passenger themselves as the main character. There might also be other characters like a fellow traveler who helps the passenger on their journey to freedom, or an antagonist who tries to stop them.
The main character is surely the passenger. However, depending on the nature of the interactive fiction, there could be supporting characters that play important roles. For example, if the story is set in a science - fiction context where the passenger is traveling to another planet, there could be alien characters or space - station personnel. These characters would interact with the passenger and influence the course of the story.
I'm not sure specifically as there could be many stories named 'the passenger short story'. It might be about a journey of a passenger, perhaps facing various challenges during travel, or having some unique encounters on the way.
I'm not sure as the name doesn't give away the characters directly. But it could be lovers who are trying to figure out their relationship using the love equations.
The protagonist is one of the main characters. And there are various Servants like Saber, Archer etc. Each Servant has their own distinct personality and abilities that play important roles in the story.
Since it's an extra story related to Soma, it's likely to feature the main protagonists from the original game. They might be joined by new characters as well. These new characters could be related to the existing ones in some way, like being from the same organization or having a common goal. However, without more information, it's hard to say exactly who the main characters are. It could also be that some minor characters from the main game get more spotlight in the extra story and become main characters in this new narrative.
Since we don't have much information, it could be anyone. Maybe it's a young traveler who is excited to explore New York.
It could be a student who is going to study in New York. They are the main character and their journey might be filled with hopes of getting a good education, seeing new things in the big city, and making new friends. They could be nervous about leaving their hometown but also excited for the new opportunities that await them in New York.