fashwave: nope (shallow copy-paste of vaporwave-inspired techniques)
‘based’/Pepe/Wojak: nope (even on 4chan, none of these originated from the /pol/ board or political discussions)
NSBM: nope (BM)
roman/viking/etc. roleplay: nope (Nazi Germans copying Roman culture is kinda funny when you think about it)
Nazi ideology/neo-Nazi ideology: nope (both are a syncretic mess of other ideology’s conclusions, as a result there’s no consistent worldview capable of long-term success)
“National Socialism”: nope (name borrowed from an Austrian party[1], named to try and appeal to a wider audience by borrowing ‘left-wing’ and ‘right-wing’ symbolism. In fact, Hitler was in favour of a different name to try and distance from socialism)
Almost none of their ‘culture’ is original. I’m struggling to think of a single part that is, whether NSDAP or neo-nazis.
I really can’t think of anything.