The late, not-so-great, “2 1/2 Inches of Fun”. Best thing about him was his username.
**Czarcasm **is my favorite username. That he’s a moderator makes it even funnier.
I like so many, especially when they are punny but since I miss this poster I’ll say Pink Freud.
Honorable mention goes to Candid Gamera.
For some reason, I love the name Thudlow Boink. Sometimes that name just gets stuck in my head like an earworm.
Tsar Chasm was a good one, although short-lived.
I like MissTake. It’s a good match for her, considering she plays poker and she’s a child support enforcement officer.
Annie-where-but-here
Typo Knig
I’m a member of the Regretsy board, I’ve always liked the username, Helenabasket
unauthorized cinnamon
I’ve been enjoying her posts and her user name for a long time here. I didn’t find out until recently that I’ve known her under a different name for over a decade. I even met her father-in-law years ago!
One of the coolest usernames i’ve came across is Merciful Lee Dickins.
Interestingly, it was he who coined the term sock-puppet for an alternate account.
http://www.worldlingo.com/ma/enwiki/en/Sockpuppet_(Internet)
I’d pay to take over the handle The New & Improved Superman.
Same here. Why is that? 
On another board I frequent there’s a user named Czechnology. He also happens to be a moderator. Hmm…
**Filthy Beast of Meat and Hair **is a good one. Haven’t seen him post in awhile though.
The very one I came in to post; I later discovered that the name came from an episode of Invader ZIM (specifically, “Tak, the Hideous New Girl”).
[off topic] Who did The New & Improved Superman used to be? That’s been driving me up the wall forever.[/ot]
I already nominated my best in a similar thread, so I won’t name him again for fear of being a sycophant. Right Bosda ? 
Today I choose jamaika a jamaikaiké
On here, cometothedarksidewehavecookies, but I also like Mal Content and Auntie Psychotic from another forum.
Olive, the Other Reindeer
Sue Dunhym
Eleanorigby
Eleanor of Acquitaine
You with the face
Nzinga, seated
Justin Credible
faithfool
I’m not sure if I have all the spelling right though. My favourite is th ealready named Czarcasm