The katana thing is based on a boogie man that twox has collectively hallucinated. It's a weak, short, fat, white incel with acne wearing a fedora and trenchcoat and wielding a katana. I don't know why this very specific imaginary man is the chosen cryptid of the Reddit female supremacist cult, but it is.

What's even more remarkable is that despite them making it as pathetic and useless as possible, they're still terrified of it. It's literally one step below being afraid of your own shadow, because at least your shadow exists.