Originally Posted by Lama

Off the top of my head:

Blondie \ Baby Doll \ Many other names I can't remember, if you're at the JCF, please let me know
Gen aka EvilTyffie
7of9 \ Emerald Dragon \ Wild Angel
Xeno \ Ellinger \ Ghaleon \ Tien \ Muza\ BloodWolf \ Too many to list
Spaztic
Beauman
rs defalcon (now defalcon, duh)
Scorp EE
Blue Ice E
Ice Wolf EE
Poison IvEE
Kaci Bear EE
Lamer EE (My first permanent name)
ShadowGpW
MErlin
Dethman
Jeh
Bluez
stripe
Brian\Milesba
Black Ninja
Death Ninja
Ninja Pack (I believe this was Scorp's name before he formed EE)
Wakeman
FoD
Cobra
Admael
Captain Spam
Onag
Bad Boy Boggy B
Mc Nuggets (The one who ran the 24hr Jazz server in Singapore)
Dino
Buster
Fôx
WhiteFang
Blackman (now MaxPower)
iCeD
Bobby
Martin aka Partydude
Mezz
Turtleslayer
Dark MooGoo
MR Magoo FK
Dr. Disguise
Dr. Dream
Slize \ SlizeFK \ Krezack \ Maelstrom
Unknown
Mattimeo
Spy AD
Raven
1 (Yes 1)
Lord Bejarid
Ducky
Roaster
PaG
ACTION HANK (later, with a request to Admael became Action Hank)
Empress Tanpopo Kiku \ Many other usernames (now Velkasha)
Fireclaw
Stilleto
JJ Tublear
JJ Sysop
Electric Ir
ElectroPiZZa
Xounmis
Laguna
Paste (Cap Spam's Bro)
Trafton AT
Paul \ Sprintman
Jeremy Brannon
Derald Snyder
Dr Jones
Psycho
Toxic Bunny
Harlan Band
Dysk
Teej
Bartman
Kazooie
Tweety
BugsBunny
Spider
Aiko
Alberto
Monolith

Many more I can't remember right now. If you were on the JMMB and want to see your username, it might be here. If not, tell me exactly what it is and I'll try to find it.