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ngl this is why I use 'frau' instead of 'fraulein' in my fics with him
it's canon that Klavier isn't actually German, so I've headcannoned that he doesn't actually know German at all and only learnt the absolute basics to get by in Germany. like how fraulein is outdated, he also uses 'achtung' which is, from my research (if you can even call it that), attention or watch out usually used in the military. now obviously he does not use it in those contexts, so again and incorrect word usage. verdict? bro has no idea wtf he's saying and just wanna looks cool
im constantly going back and forth between thinking klavier calls the women in aa Fräulein in a demeaning/sexist way or thinking that it was a localization issue and its not meant to be taken that way.
Fräulein is kind of an antiquated word, its akin to miss in english and is meant to signify an unmarried woman. much like how the difference between miss and mrs is falling out of use in english, Fräulein carries a pretty sexist connotation and is seen as belittling, like the woman in question is not as valuable as a married woman who's given the title Frau. (the dimunitive -lein is usually added to words to indicate that they're small, so its essentially suggesting that a woman without a husband is smaller than a married one.)
my question to you is, is this intentional? i could definitely see klavier being a dick to ema, but this is basically his go-to for any woman he interacts with. alternatively, its intentional but its meant to suggest that klavier is not really german and only uses german words for his rockstar persona, so the meaning didn't carry over to him.