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 understand what i'm asking. don't use that example for my question, since my question is about any situation that a word would fit in. 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)

How are the two arguments made in the passages different? a. the first passage claims that pets in class will children with health problems; the second passage says pets will make some health problems worse. b. the first passage claims that students’ nervousness will decrease around pets; the second says that students’ nervousness will increase around pets. c. the first passage claims that pets will make the teacher’s work easier by keeping students busy; the second passage says pets will make the teacher’s work harder. d. the first passage claims that pets in school will be good for kids’ mental health; the second passage says pets will be bad for kids’ mental health.