When a narrator quotes someone else's words, they have some influence over how we interpret and react to the quoted words. We call this "narrator interference".
The maxim of relation is an expectation that people will say relevant things in a conversation. It is one of the four expectations that make up Grice's Maxims, otherwise known as the Cooperative Principle.
The maxim of quality is an expectation that people will say truthful things in a conversation. It is one of the four expectations that make up Grice's Maxims, otherwise known as the Cooperative Principle.
The maxim of manner is an expectation that people will be clear with what they are saying in a conversation. This is one of the four expectations that make up Grice's Maxims, otherwise known as the Cooperative Principle.
A Mary-Sue is an idealised character without nuance. They don't have flaws or limitations that impact them in meaningful ways, and the story's plot and characters revolve around them. They don't need to struggle, so their existence cheapens the tension.
Litotes is a language device where you combine a negative word (like "no", "not", "don't", "isn't", etc) with a word or phrase to express the opposite thing for effect. For example, "I'm not happy" means you're unhappy.
The term "interlocutor" refers to people who are speaking in a conversation. In other words, the interlocutors are the participants of the conversation.
An initialism is a type of abbreviation where you combine the first letters of each word in a sentence or phrase. It looks like a new word, but you pronounce each letter individually when you say it out loud.
The implied reader is the person (or group of people) that we infer a text was made for. We base this inference on the text producer's decisions about language, narration, characters, plot, structure, form, layout, mode, context, genre, etc.
An implicature is a hidden or implicit meaning that you create when you break one of Grice's Maxims.