As I don't know the specific 'la impostora full story', I can't say for sure what the main characters are. But likely there would be the impostora herself. There might also be the people she is deceiving, such as a family she infiltrates could have a mother, father, and children as characters.
I'm not entirely sure which specific 'la impostora' story you are referring to. There could be many works with that title. It might be a movie, a book or a TV show. Without more context, it's difficult to provide the full story.
I'm not entirely sure what 'capitulo simpsons pulp fiction' specifically refers to. If 'capitulo' means chapter in Spanish, perhaps it could be about a chapter related to 'The Simpsons' that has some connection to 'Pulp Fiction'. Maybe it's a fan - made crossover idea where elements of the two are combined in a particular chapter or story.
I'm not entirely sure specifically what the 'impostora 2017 full story' is about without more context. It could be a story about an impostor in 2017, perhaps in a game, a movie, or a real - life event.
As I'm not aware of the 'impostora full story', it's difficult to determine the main characters. But generally, in a story about an impostor, there would likely be the impostor herself, the people she is trying to deceive, and perhaps some characters who start to suspect her true identity.
Another theme might be the subversion of expectations. We expect the Simpsons characters to be in their normal, comical situations. But if there are elements of 'Pulp Fiction' involved, like unexpected violence or complex moral situations, it subverts what we know about the Simpsons. So, subversion of expectations could be a theme.
Since we have no prior knowledge about this 'impostora 2017 full story', it's impossible to give a brief summary. It could be anything from a crime story to a relationship - based drama with an impostor theme in 2017.