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The Narrator character is not only the narrator of the story being told, but can appear as a character in the story. However, it's the creator's decision to make the narrator a part of the cast or not. Whether or not the narrator in your story will be apart of the main cast, here's an article about how to make the narrator an interesting and likeable character.
The Narrator is the Story TellerThis is the guy in charge of telling your story. Whether this character is some kind of Author Avatar or another character completely, this job is important! Make sure your narrator tells the story the way you want it, in a way that brings the reader in the story and makes the reader want to know more. The narrator is usually reliable, but having The Watson for the narrator can help the reader think about the situation in the story really think deeply, even telling the reader what they might've overlooked. An Unreliable Narrator can make readers confused, but can be fun to play around with if you do it right. The Posthumous Narrator can be a character in the story, but depending on who is is, it can either work out or sink... Choose what kind of narration you want carefully. Make sure the narrator brings out the story you have.
The Narrator is The Chick?!Having a member of the main cast narrating the story may be difficult for some. Since most literature is written in third-person from a seemingly omnipresent narrator or told from first person from the main character's point of view, having a character that's not the main character may seem like a strange idea to some. To do this the following options may work:
The Narrator is Me! I'm the Hero!Having the main character being the narrator is typically done by having the hero tell the story in the first person or Narrating the Present. However The Hero can be the narrator through Let Me Tell You a Story and that hero was me. Depending on the hero being Book Dumb, Book Smart, Genre Savvy, or whatever else can make narration different. It can show how The Hero changes during the story, what lessons they learn, who they come across and how they are maturing throughout the story. This is something to consider.
The Narrator is the Omniscient Being We All Thought he wasHaving the narrator telling the story in third person is typical for most works. But making the narrator an omniscient being who Breaks The Fourth Wall and addresses the reader directly isn't. Having the narrator address the reader through comments at the end of each chapter, through normal narration, or being introduced at the beginning of the story can make the narrator seem alive, like a real person. This can be done creatively in manga or graphic novels, giving the narrator a face and body to call their own, having them appear in their own segments. Typically this is done by giving the narrator no real features, covering up their faces or hiding their identities. However giving the narrator an actual face and body can make the reader feel comfortable and make the narrator more relatable.