narrator

The character who tells a story is the narrator. There are various kinds of narrator - present (acting in the story) or absent (merely a voice), omniscient (showing no "gaps" in their apparent range of knowledge e.g. knowing other character's thoughts) or ignorant (betraying their lack of knowledge at times) etc. Biblical narrators are often rather like God, seemingly distant yet at the same time omniscient. Properly speaking if the "teller" is not a character in the story we should speak of them as the "Implied Author".