Wilbur, right?
mmm
M. P. Sims
If I didn’t have my current username, I might consider Sweet Amber Poison. But that name probably doesn’t mean anything to most people. It’s from a song I like.
Can we steal from radio shows?
From Car Talk:
Erasmus B. Dragon
Mahatma Coat (I hope this is not disrespectful, since I believe “Mahatma” is a title of reverence)
Pikov Andropov
Bud Tugly (I might like to reserve this one for myself)
Mike Easter
Marge Enovera
Euripides Upman
Heywood Jabuzzoff
Estelle Hertz
Donatello Nobody
Morley Krupt, Ethicist
(lots more, but I can’t remember them)
From Prairie Home Companion:
Sarah Bellum
From a much older radio show (a cookie if you know which one)
The Wad of Chaw
The Famous Eccles
Bluebottle
Hercules Grytpipe-Thynne
Seagoon
Phil Osophy
Bertha de Blooz.
Amen!
eta: just googled Bertha de Blooz…there’s a million of 'em out there already 
Liquor In The Front
Poker In The Rear
Carbonated
Benny Suggs (US Navy reference)
Geedunk (another Navy reference)
Skylarker (yet another Navy reference)
Gundecked (there’s a pattern here)
Scuttlebutt (take a guess…)
Mister Bread (sig line: “Doughy, man!”)
Renakaglook Pietstomp
[characters from a comic I drew in high school]
The Goons! Chocolate chip, please.
Would you like to take it with you or have it sent?
>Sent.
(Explosion of cannon)
It will be waiting for you when you get home.
Roddy
Celestial Boob
Shane Wayne McClain
Dick Duck, Doc
Bill The Galactic Zero
Glenn Even Closer
Euripides Trousers
Eumendides Trousers
Super Ghoti Al
Aaron A. Jeestrynge
Ralph Royster Doyster
Lady Constance de Coverlet
Dame Celia Molestrangler
Fiona Rabbit-Vacuum
selected from the Pulp Sci-Fi Title-O-Tron The Random Pulp Science Fiction Title Generator from Cornelius Zappencackler's DERANGE-O-LAB
Lost Waitress of Saturn
Onslaught of the Accordion
Aviatrix of the Eidolon
Skeletal Sentinel
Malodorous Monument
Eternal Pirate of the Aether
Profane Ferret of Yesterday
Pulsating Ferret of Doom
Notat Allbright
Vlad The Inhaler
Bloodimir Footing
Doctor Whom
Some obscure ones:
Which Tyler
Struwwelpeter
Joulupukki
S. Morgenstern
Skarl the Drummer
El Caganer
Zibarro
There is (or was) a flamingbananas IIRC.
I would preserve the Nordic feel but go for Vik the Inhaler.
I quite often think of good potential usernames, but then when it comes to registering for forums my mind goes blank. I ought to keep a list.
There was a cartoon on the Captain Kangaroo show called Tom Terrific that had some great names, none of which appear to be taken.
Tom Terrific
Mighty Manfred The Wonder Dog
Crabby Appleton
Mr. Instant, the Instant Thing King
Captain Kidney Bean
Sweet Tooth Sam
And my favorite:Isotope Feaney, The Meany.
I’m the Cow God Moo
Don’t poke the bear, Dad!