Thanks to Hardcore Gaming 101 picture, now we know that there was canceled MSX2 version of The Guardian Legend that was developed simultaneously with the NES version.
Original tweet is here: https://twitter.com/HG_101/status/1362078921513197579
A very few screenshots of the bosses of MSX2 version was posted in a magazine. Seems the MSX2 version was much darker and scary:
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