I used to be registered here - havven't been active since long before the server change. But anyway, I thought I'd post this.
Several years ago, I used the wonderful program of MUGEN to compare original Zero and Rugal's sprites, proving that O. Zero isn't Zero with Rugal's head, he's an edited 2000 Zero sprite without the moustache.
Since people have brought up some confusion on Mizuchi vs. Orochi, I thought that I'd try to clear the air.
yues, Mizuchi is redrawn. No, Mizuchi does not use the 1997 orochi sprites.
You can really see the difference in this image - I simply loaded up the recently-released Mizuchi alongside Orochi, and hit print screen while they were standing together. They look mostly the same, but there are subtle differences in height, hair, musculature, etc. etc. The two sprites are ver similar, but NOT the same. And yes, that size difference is genuine (unless the MUGEN guys got their scaling wrong, which is always a possibility.)
Now, for the real question: Why mizuchi and not orochi? Is there a bio for this guy?