As we don't really know the story, it's hard to say for sure. But most likely, the main character is the girl. And if there is a 'ghist' which I assume is meant to be 'ghost', then the ghost would be another main character.
I'm not sure specifically what the'sweet ghist girl story' is as it's not a common well - known story title. It could be about a very sweet girl and some kind of ghostly or spiritual element. Maybe it's a made - up story by someone in a local community or a personal anecdote.
The title 'ghist meets girl a mayakashi story' is rather mysterious. 'Ghist' might be a misspelling or a very unique name for a character. 'Mayakashi' gives the impression of something related to spirits or the supernatural, often seen in Japanese - inspired stories. If this is a story, it could be about how this 'ghist' character comes across a girl in a setting full of Mayakashi - like elements. Maybe the girl has a special connection to the Mayakashi world, and their meeting sets off a series of events that could include things like solving a mystery, facing a threat together, or even falling in love in a rather strange and magical context.
Perhaps we can expect a story full of surprises. If 'mayakashi' implies something like spirits or magic, then the meeting of 'ghist' and the girl could lead to all sorts of adventures. They might have to face challenges together, or discover secrets about the 'mayakashi' world.
Since we have no details about 'the 100 girl story', we can only guess. Maybe there is a leader among the 100 girls who is a main character. Or there could be a few girls who are different from the rest in some way, like having unique skills or personalities, and they are the main characters.
I'm not sure specifically what the 'ghist in the shell original story' is. It could be a very unique or niche story that I'm not familiar with. Maybe it's a story about a character named Ghist in a shell - like a shell in a game or a particular fictional setting.
If 'ghist' is some kind of made - up or very rare term, it's difficult to say. However, generally in a story within a ghost story, it might be used to add depth. For example, the inner story could be a flashback about the ghost's past, explaining why it haunts. It could also be a story told by a character in the main ghost story to either scare others or to try to figure out what's going on with the ghost.
I don't know the specific 'the sweet love story', so I can't say who the main characters are. It could be a boy and a girl, or two people from different backgrounds.
Given the lack of knowledge about the 'ghist in the shell original story', we can only make educated guesses about the characters. Ghist, being the central figure (presumably), could be a complex character with a range of emotions. It might be curious, constantly exploring the shell it is in. There could also be secondary characters that are integral to the story. For example, there could be a mentor - like character that guides Ghist in the shell, or an antagonist that tries to stop Ghist from achieving its goals within the shell. Without more details, it's impossible to accurately describe all the characters in the story.
Well, surely the girl herself is a main character. And probably her family members, like her parents or siblings who would be deeply affected by her vanishing. There might also be a detective or a police officer if it's a mystery - style story, as they would be trying to solve the case of her disappearance.
Since I don't know the specific 'danger girl x girl story', it's hard to say exactly. But they could be two young women with different personalities. Maybe one is brave and impulsive, while the other is more cautious and intelligent.