Friend of mine went to an Australian WW2 museum, and there was a bunch of propaganda about Japanese invasion. They'd taken Australia's outlying possessions and were threatening the mainland.
Now this is a strictly "fascism bad" cohost, but imagine just the language of a Japanese-occupied Australia. A language with multiple distinct formality levels mixing with a language where "cunt" is a pronoun. Takoyaki Sangas. Baz-senpai. G'day Ojou-sama. Shouganai cunt.