Fruity Pebbles
Lucky Charms
All Bran
**Unfair dinkum
Pico Metre
Crude atoms**
None of those fit quite as well as AllWalker, though.
Welcome Conbracos - a delightfully inexplicable phrase my friend and I once saw on a marquee in Myrtle Beach. I also might shorten it to just Conbracos, in an attempt to get someone to say the phrase to me in my introduction thread.
Nutrient Mantis - I can’t remember which service it was, but an online game server with a random username option dubbed me this years ago. I liked it, and have used it as an alternate online moniker since.
Vegeta McChicken - this is how I sign my credit card slips for my Bank of America card. Despite having made $1,000+ credit transactions, I have yet to be called on it. I believe I signed that way when I opened the account, so as far as the bank’s concerned, that’s my legal signature.
I’d have ThePosterAbove, TheOP, or AllThePeopleHere, because that would be wonderfully confusing when people responded to my posts.
I wansn’t too creative with Mudshark.
MrGreenGenes since it is my e-mail.
Godzilla’s Tacos is an inside joke, but sounds cool.
SpaceOwl but my one friend that posted here wants to change her name to that when she starts posting again, so I said she could have it.
Jesus
Muhammed
Giant-Sized Man-Thing
spork!
I have two more, don’t !?
Millionth Monkey, since I write for a living. This is what I want to name my business if I ever become a freelancer. I realize that the actual thought experiment involves an infinite number of monkeys, but that doesn’t scan nearly as well.
I don’t know if I’d want to pick the name of a book or film character, but if I did, I’d go either Markov Cheney or August Personage, neither of which, I’m surprised to find, have been picked.
Meatspace Adventurer: I just thought of it and I liked the sound of it. I think maybe because more and more people seem to spend more of their lives online, the idea of someone that actually does stuff in the real world was appealing.
Sulu the Bionic Hamster: After a cool character in the Captain Underpants book series, one of my son’s favorites.
I have a third pick, I’ll have to think about it.
John Jacob Jingleheimer Schmidt
Vera, Chuck, and Dave 
Rex Dart, Eskimo Spy is an obscure pop reference.
Paintergeist is my name elsewhere.
**Ron Torgelsons Armada Featuring Herman Menderchuk ** From KITH.
Crandall Spondular, of course, three times.
Desperado
Carry-On
Sansavec
Fidez Castro.
Fidel Castrated.
Shakespeare’s Monkey Butler
Amblydoper - Play on amblyope, because I am one.
Dan The Man - Everyone calls me this
Danimal - Same reason, although I don’t know why (Am I a man, or an animal?)
Reasons?
Mr. Apollo – A Bonzo Dog Band song
Monkey on a Pedestal – a great line from a song in The Drowsy Chaperone
Leonard Adolph Julius – as others have noted, the first names of Chico, Harpo, and Groucho Marx.
Remedial Polymath
Whiskey and Ryan - Just because
Hondo Botswana - I had a dream once that I was a punk rock great white hunter who killed giraffes in Africa for some reason, and I woke up and decided that I needed a name for that. Hondo is the name of a shitty cheap electric guitar from Japan that I used to have and Botswana for both the African reference and for the similarity to Jello Biafra’s name. I use this as my name in most video games.
I have no idea about the third.