>read or watch Harry Potter, low-brow Anglophone fiction
>"Potter" and "Malfoy" refer to each other by their family names because they are on bad terms
>"Harry" and "Ron" however are friends and refer to each other as such, while "Malfoy" refers to the other boy as "Weasley"
>also significantly "Malfoy" refers to his associates as "Crabbe" and "Goyle" rather than by their given names, which emphasizes their relationship, contrasting it with the protagonist trio

Oh but we can't do this when translating Japanese, high school students don't talk to each other like that! The English language when used properly definitely doesn't have strict hierarchical language and tone, and Anglophones definitely don't code-switch based on context and adjust their grammar and vocabulary according to the context. That's just a weird Japanese thing we need to erase!