Alas, I don't know enough Japanese to know just
how bad it is, but apparently 「ロツワ」 (rotsuwa) has become a sort of inside joke amongst some Japanese fans of pirate original games. That is how VFame misspelled 「ロック」 (rokku) in the intro to Rockman Z. That's right. They misspelled
the main character's name. (Admittedly, the characters
do look similar if you don't know Japanese kana...but
still...)
There's also frequent reference to 「せんソょうし」 (sensoyoushi, where the 'so' is in the wrong alphabet entirely) in the intro. I'm gathering this is probably supposed to be 「せんびょうし」 (senbyoushi), which means 'death from disease caught during war'. This is an amusing enough mistake that it's actually a keyword on one of the Rockman Z playthrough vids on NicoVideo.
I wish I knew more Japanese now so I could laugh at it even more. But if anyone here is reasonably fluent,
here's that playthrough video again, with intro.