This is a revised list based on the latest build I found on Hotline and some rumors I've heard on IRC.
: So, our current known list of the MEAMUC is...
: The Casual Observer (Baes'bahl), Insane Sheep of the Bors
Honorific is actually (at least now) Wacky Sheep of the Bors in response to concerned parents' groups dislike of the connotation of the word "insane."
: Nailbiter (Dumass), Patron of the Danged
That's correct, but I should point out the narrator pronounces it like pat-run not pate-run.
: The Receiver (???), Source of the 500 Socks Without A
: Single Pair That Actually Matches
His name is bearded, or perhaps beerdread. I was to find a concensous.
: Tingle/The Nameless Voiceless Faceless Sexless One
: (Yomomma/Culhio), Well-Loved Child Who Somehow Went
: Bad Anyway
In b7, the honorific has become Beloved Child of a Traditional Two-parent Family who Somehow went Bad Anyway.
: The Dorker/Pizzaslicer (Sheila), Twice-Removed Cousin of
: Bob and Alice
In the quick glimpse I got, the honorific appeared to be "Twice-Removed Cousin of Bob or MB Alice," highlighting her large family and questionable parentage.
: The Brainless Man (???), (???)
Burt Reynolds, though it is unclear whether this is a name or honorific. (If you don't get this, check out Nightcrawler's entries to the Myth II Humor Contest.)