According to my browser's auto-complete function, the following are all examples of user names I have used when posting comments on the comment boards at the Onion AV Club.
Or more precisely, these are all things I've typed into the "name" field, but I do remember that in some cases, the user name I tried had actually been reserved by somebody else, so I couldn't comment under that name. I remember specifically that this was the case with "Comic Book Guy"; there are probably others as well.
I'm amazed at the number of different names on this list. However, I know that many of them I only used once, often as part of a one-time joke that probably made a bit more sense in context ("FBI guy" and "Leslie Nielsen" were both examples of that).
A 96 percent heterosexual man
A British Columbian
A Canadian, so why do I even care?
A mildly buzzed contrarian Canadian
A semi-regular who doesn't wanna log in
A west coaster who now lives in Toronto
A young socialist-leaning hipster
An aspiring academic
Another Obligatory Simpsons Reference Robot
Aspiring Jay Leno writer
Barbara Hershey Squirt
Borat Sagdiyev, Esq.
Burns and his PR guys
being slightly more serious than I usually am
Comic Book Guy
Comic Book Guy Jeff Albertson
don't wanna log in
Floyd Bent Son
Fuhrman, pushing the boundaries of taste
Guy who stretches things
Guy who uses broad ethnic stereotypes
Homer J. Fong
Homer Jay Simpson
I stole these jokes (can you guess the source?)
Jerome Allen "Jerry" Seinfeld, standup comic
Kang or Kodos
Leslie Nielsen, again
Man nostalgic for seasons 4 through 8
McBain, hosting a late night talk show for some reason
Mitch Hedberg, Esq.
Mr. Peter Griffin of Quahog, RI
Nameless maneless salesmen
Not logging in right now because the web is slow because I'm multitasking
Paco von Sourcream
Scarface Q. Pinkington the 8th
Seinfeld and Carlin's less talented cousin
Skullturf Q, too lazy to log in
Skullturf Q. Beavispants
Slobmeister Q. Funnyface
Snorfgasm Q. Publicpants
Tha Revverrennnd Chah-aunceee Grizz Leigh
That Russian guy whose name I forget
The Barenaked Ladies
The dogs with bees in their mouths and when they bark they shoot bees at you
The guy who posts Onion headlines at the AV Club
Those hippies from the film "Herbie the Love Bug"
Too embarrassed to say
Two Harry Shearer characters
Yeenoghu, Demon Lord of Gnolls
You Know Who