What word would you generally use for someone who is clearly known by the main character in a book, but's name is not said yet?
For example, if the main character was practicing fighting with someone they clearly know, but a name hasn't been said yet.
This example is just to help understand what I'm asking. Please don't use that example for my question, since my question is about ANY situation that a word would fit in.
PLEASE ONLY ANSWER IF YOU KNOW THE ANSWER. (PLZ PLZ PLZ DON'T SAY I DON'T KNOW. IF YOU DON'T KNOW THEN DON'T ANSWER)