I know of an edit that has actually eluded this roster for quite some time:
Cheat Bug Mizuchi by Zako.
https://onedrive.live.com/?cid=34741119DA4C3E69&id=34741119DA4C3E69!105
It's an edit of Mizuchi themed after video game glitches.
Retains the usual moveset, but the way he moves...well, that's a different story.
He DOES have some cheap stuff, but it can be toggled on and off.
I do believe that he's beatable with normal characters; in fact, he actually has a few intros where he KOs himself(as well as one where he can't do anything until he gets hit once).
I highly recommend that you go here in case you don't understand the references he has: http://wikiwiki.jp/htrespect/
(The site's in Japanese, though.)
Oh, and I have identified the voice of "WTF Mizuchi by 2010LifeGame & Areankaine74u", for the most part.
*"OW, THAT HURT!": No clue.
*"(girly shriek)": No clue.
*"(crying)": No clue.
*"YOU'RE HURTING ME!": No clue.
*"OH NOOOO!": Heavy Weapons Guy (Team Fortress 2)
*"OWWW!": No clue.
*Everything else: Dr. Robotnik (Adventures of Sonic the Hedgehog)