Vec said there should be one... so I made one! 
The concept is simple, just name all your alts. Maybe give origins/explanations if you feel like it. Alternatively, you can reply to this topic as each of your alts.
Here goes:
John Barrett - Serious name, current main posting account, will mostly likely be used for any other forums I register on. Will also be my master account should I ever get CheezyReporter
Sgigsby - W33rd little dude who's too cute to not have an account. Pic
General Pingu of the CPNP - The CPNP are the Cybernetic Plasticine Ninja Penguins, my elite personal army. General Pingu is their leader.
Super Toilet Duck - QUACK! o_o
Patrick Moore and his Xylophone - Because he took take on the badgers and their mushrooms any day of the week. 
Garter of Darkness - PSX's idea upon seeing 'Socks of Doom' in the chat.
Lokkietta Gallansbayne - Lokki's female form. Pic.
Dranakath - Old nickname of mine, now Lokki's evil robotic counterpart. Also doubles as a Megaman fan character Pic.
Glebur Detrakerk - One of my NeverWinter Nights characters. Pic.
Lokki Gallansbayne - My main persona, who coincidentally has never had a successful RP run. Pic.
Wilbert Samthinorover XV - One of my characters, a deranged old wizard.
Wilbert Samthinorover XVII - Wilbert XV's grandson, a rebellious teen turned righteous paladiny-type dude. Pic.
Wilbert Samthinorover XXI - A descendant of Wilbert XV, she is also a wizard.
Arctos the Monk - A mysterious, scythe-wielding elf and Monk of Thanatos, God of the Ends of Life. Pic.
Xaviera Holtsdohtor - Lokki's wife (?). Sprite.
Kawamura Takara - Purple many-tailed psuedo-kyubi-no-kitsune demoness. Yeah. Pic.
Anguis Cantor Liberalis - Pink anthro dragon minstrel! 
Nuchtos - Originally my main Sonic fan-character, has undergone much change to become a character in his own right. Pic.
Nuchta - One of the characters from the same universe as Nuch, I won't go into the fine point.
Joy the Hedgechao - Again, same universe as Nuch. Pic, complete with old-design Nuch.
JOY the Cyborg - Non-furry version of the above.
Roux the Cat - Same universe as Nuch. Pic.
Elektra Finn - Again, same universe as Nuch.
The next few require little to no explanation, suffice to say they were all spur of the moment things. And even if I did have pics, I wouldn't link to them.
Live Nude Rouge
Live Nude Shadow
Live Nude Tails
Live Nude Roux
Live Nude Lokki
Live Nude Xaviera
Live Nude JOY
And more that I've forgotten. I'll edit back with explanations some other time.
Acrio the Fox
Acrio the Raccoon
Acrio Hedgehog
Acria Hedgehog
Dark Acrio
Light Acrio
Super Acrio
Hyper Acrio
Eternal Acrio
Acrio
Acrio Doll
Sailor Trivia
Sailor Walnut
Sailor Mongoose
Red Christmas Pika
Blue Christmas Pika
Green Christmas Pika
Mongoose Whitney
Mongoose Stephany
Delicious food
Kurumi
Yellow
The Gentlemen
Which is about 20. And I'm sure there are more that I forgot to list. I don't even use some anymore. ^^;
Sakaki22
Sailor Morbid
And two Council of Dr. FexusFan-related ones which shall remain secreted. As we are a council of secrecy, or something o.o
SilverSonicShadow (Newbie name)
Project Blue Gale (Main Account)
Joshua Gale Avalon (RPG name)
Tunz the Panda (2nd RPG name)
Sailor Kitchen Sink (Fun one-shot name)
Sailor Live Nude Robotnik (Mental Illness)
Sailor Blue Gale (My Sailor Sickness name)
Avalon CCM (Alternate for serious conversation)
FHL Walker (2nd Alternate for serious conversation)
Common themes: "Gale" meaning Wind. "Avalon" meaning Heaven.
Gotenks the Hedgehog (main one)
Megami the Hedgehog (female counterpart)
Megami the Cat (cat form of Megami)
Jennifer the Hedgehog (no longer used)
Sailor Goddess (senshi form)
Sailor Deathstar (no longer used)
NeoPikmin (first name, no longer used)
That's all I remember. o.o
I only have two at the moment.
Dreamer of Nights -> the main account
Evil Dreamer of Nights - > the alter ego
I'm planning to create a sailor form of the main account, a serious account, and maybe a furry character to the list but as for what I have at the time of this post are the two posts above. 
Hmm.... if I can remember.....
kitsune23 (Newbie)
Ruby The Kitsune
Crystal Kitsuni
Klonoa The Dreams Traveler (Used every now and then.)
Rogue Bat
Mirai Ruby (Never used at all, really. o.o)
Ruby and Aqua (Only used in about 4 posts. o.o)
Rita the Fox
Rose the Wolf
Pheonix Kitsune
Ruby Kitsune (Main.)
sankon (Used Every Now and Then)
All the ones without parenthesis marks aren't used anymore. (Except for 'Mirai Ruby' and 'Ruby and Aqua'. They may have marks, but they aren't used.)
Lets see...
The Human Shadow: Main account, shadow demon.
The Demon Shadow: Evil account, brother of THS, shadow demon.
Captain THS: Chat account, pirate form of THS, shadow demon.
Wez4: Original account, deleted. o.o;
I have three accounts still active! Wheee...
Okay, here goes. In order of date of creation....
Sparky (Local, normal chat account & posting account)
- Psycadellic Kitsune Squirrel cross-breed bent on taking over stuff, inspired by a fellow starfleet command 3 player.
Evil das Cat (Global, deleted.)
- The original sinister cat from Heck, a la Earthworm Jim. Evil the Cat was already taken.
Sparkzter (Main Global account)
Inspired by another blue wonder (Sparkster the rocket night) likes to cause chaos and/or come to the rescue.
Sparkle the Kitrel (Global, phased out of use)
Originally part of Sparky himself, she was split from him and was a cutsey terror in her amy dress. What a surprise, that got boring easily.
Eva the Kitty (Global, current chat alt)
The 'replacement' of sparkle as my 'alt', she is the result of splicing Evil & Sparkle DNA together. She can only communicate by a series of meow-type speak, which came from the old 'charlie the cat says' UK infomation adverts.
(I put the descriptions back up after a few others put up descriptions as well. w00t. And if anyone apart from me remebers those Charlie the cat ads (they looked like south park animation) I'll be very surprised.)
I did this topic in the SPA quite a while ago...
Xagarath Ankor
Rhymemaster
Rhymester
Graknir Slugfest
Darkling XA
Xagarath
Official Strange Person
Sailor Darkling
Xenomorph Ankor
But if I tell you all my alts, it'd ruim the element of surprise... *slopes off, snickering*
Sam has alts?! Oh my my my...I wonder who they could be...
*decides to keep an eye out for similar posting styles*
Ahem.
Name's of Alt's and piccies - if possible. ^^
Mobius Springheart: www.geocities.com/sktnz/Mobius.html
Caleb { Aka 'Caleb Springheart' here. } : www.the-chosen.com/chosen/Char_Caleb.asp
Sonic Maurice Hedgehog: I don't need to direct attention anywhere. XP You should ALL know this one.
Robikku: No picture
Darksyde Echidna: No picture
Chyron Blackwolf: www.geocities.com/sktnz/Chyron.html
There ARE others, but I'm not gonna divulge ALL my secrets now, am I? ![:]](https://www.echidnoyle.org/gamemusic3/forum/smilies/biggrinshaded.gif)
One Tru Blu: Main Account
One True Blu: Fear The extra 'e'! Seroiusly though, Why do I have this account?
One Tru Sue: Female Account, somebodeh girled me!
Super Tru Blu: Super powered blu-man!
Evil Lord Tru Blu: Evil Counterpart, Ish very ebil.
Comet Squirrel: Main Fan-fic character
General Ivan Errol Meteor: Evil Fan-fic character
Dane The Danegerous: RL Nickname account
Dane Worrallo: Real name Account
LN Tru Blu: If you know what a LN account is, here you go
The Trashmaster- He empties your trash o.o
Joe Robinson And his Ice cream Van- SOMEBODY's gotta serve icecream around here >.>
The Clone Collector-he appears randomely in the EzChat, And takes T3h clones!
The Undead Army- My own personal Army, fronted by Sir Trevor Wraltzson, the immortal.
EDIT: I found some more accounts, that makes 14! Edit in more soon...
What if i'm one of the alts of sam? what if EVERYONE IS?! What if this entire board is really only made up of one very very messed up person!?
And I would've gotten away with it if it wasn't for you meddling kids!
I was thinking of making this topic after Vec mentioned it too, but I didn't get a chance to. 😛
Anyways...
Hyper Sonic Warrior <-- First and Main Account.
Chibi HSW <-- Chibi-ness. o.o
Sailor Yazigi <-- First alternate account. I originally made it just for the sake of having a Sailor account. o.O; She's evolved into a 'proper' RP Character and was never really a senshi. -.-
Zigi <-- SY/Yaz's brother.
Fat Sonic Warrior .>
Dragon Sonic Warrior and Hyper Warrior Fox <-- Erm, for some strange reason, I decided I'd make accounts for HSW's other forms. Thankfully I stoped at HWF.
The Sonic Warrior <-- Originally just created to see if I could get in the chat if I made a new account when I was having problems. Now very rarely used, and when it is, it's 'Toot', a character I used to use in the new SPA.
Hyper Amy Warrior <-- Erm...Yeah. I got girled. o.o
The Real MC Hammer <-- ...Random whim. Meh.
The Rabid Pikachu Army <--Self explanitary, I would've thought. 😛
Sugar The Chao <-- Originally 'just HSW's Chao', she's now one of his closest friends.
Cute Pacifist Tuxedo Ziggle <-- HE IS TEH ZIGGLE. o_o ...Yeah, sort-of exact incarnation of my RL self with some twists, and sorta-kinda counterpart of Pretty Soldier Sailor Squiggle.
Algelita <-- Ask Lilix Kitty. 😛
LNH <-- This account's actual s/n isn't really LNH. I'm abbreviating it in this thread for a reason, and I'd appreciate it if no one else stated what it is unabbreviated. This account was a stupid mistake. I have nothing more to say.
...And that's all I can recall. I think I might have more...Though I'm not sure.
Mine would be as follows:
Silvershadow0 - main account currently. And trust me, I would've quite happily had two capital "S"s and no 0, but I got stuck with it.
EternalShadow0 - Super super evil form of myself. And the same goes for the 0 here.
GemaJinn - SilverShadow's lil' sis, I don't use this account so much anymore. In fact, I pretty much gave it to my bro.
Nocturine - Another of SilverShadow's sisters. VERY creepy.
IceOnic the Snowhog - Newer account, one of my other charas.
?????? ???? - Ah, but that would be telling, wouldn't it?
SilverShadow.
I know one of Sam's alter egos but I won't mention it just yet. 
Hmmmm...not much...I have...
EpyonJ
Epy
EJ
AnDrOid ClOwN
Sogen
Cecil
James.
=P
BFFG main character (undergoing a complete character upheaval)
Chaos Storme
Neo-Ironman MKII
Flash the Hedgehog
SPA only egos
Kid Buu DB
Hero Buu (alternate form of Kid Buu)
Sora
I may have forgotten some, there are also several secret ones. No female and/or sailor forms...yet.
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