Being that it is close to release and all, why don'ts we all post all the nicks we ever flew under! yeys, how fun!
I'll go first(in no particular order)

Soccer Ball(B)
Akkisti
CRU 1
CRU 11
[CFx]Tang
[Syn]Tang
Scuba Steve v1.7
[NPCDEF]Flag 1
Naarkra
Scuba Steve 3.0
Scuba Steve 8.0
Scuba Steve 8.1
Scuba Steve (8.0)
Scuba Steve 9.0
MoonBot
HumpyThePenguin
Waylonics Translator 52B
Eriad
Skrail
Shadow of the Last
Omni
Yukinari
Lt. Gov. Bustamante

more as I uhh..remember them. I know that isn't all :/

Pyro and Tyrdium. Yay.

[TFV]silentsuicide
Serco Prime
[S7] Turret#2
Risk
CRU 7
[TPG] Enforcer 1
Captian Kirk (sexiest man alive)
[INM] silentsuicide
Wyeth

Testing...

W00t. Thanks, a1k0n!

Magus
Sage
Sir Frog
Lavos
B00M
Sa|nt
Defense Ship 8
Defense Ship VIII
Freyr
Pavan
[S7] Turret #7
[S11] Turret #1
Magus(Photographer)
Magus Spy
Union Soldier
Gold 3
Avatar 2099
Airborne Express
Devastator

Wow, that's a lot 0.0

You were Gold 3 ;p

Oh yeah. I was.
I was Avatar2099 too.

?

3 resets ago also: & and ^ (no plans to revive them though).

toshiro (crimson)
toshiro kanchou (crimson)
Tycho (crimson)
blacksad (crimson)
[S.A.W.] ##classified## (the first, not the latest incarnation of the S.A.W.) (crimson)
leopard (crimson)
R.A.F. chars I don't remember (crimson)
Kuwabatake Sanjuro (crimson)
RC Guise mt (crimson)

ganryu (azure)
Leela (azure)
banshee (azure)
white tiger (azure)

Durandal (gold)
lion (gold)
other feline names I don't remember (diverse nations)

Whistler, Auric, g0ld3nb04, Aurical, Red Menace, Oracle, Sherpa, Shepherd, Blue Meanie, Harbinger, Aura, The Orb, (to be continued as they occur to me)

Hamstur the Unqueakable, Serco Monk #?,

Wow... I always forget FM is human and not some meta-being that skips between planes of reality.

Spider, Spider[Red,Gold,Blue], Anazasi, Ananse, Nauthiz, Dread Pirate Bill, Carrion, scavenge

*ponders* I know theres a few more, A few unknown "pilot 15" style characters for various raids, and some other such things.

zamzx
zamzx GOLD
lminer
defenceship 6 (I think)
Blackhole Razorclaw
Blackhole Goldclaw
bug guy
The Astroidy (whatever :P)
[SDF] Disenergrater

%    Roguelazer <-- Itani
     [VPAI] Roguelazer <-- Itani
     [INM] Roguelazer <-- Itani
     Blue Vault <-- Itani
     Itani Vault <-- Itani
     [S7] Turret #0 <-- Itani
     [S7] Turret #1337 <-- Itani
%    Ion_Fighter <-- Serco
%    ambient7.ogg <-- UIT/NT/Gold
     *** <-- Itani
     |ncarnate <-- Itani (long ago...)
     <***> <-- Itani

Nicks with a % sign are currently in use

mr_spuck : NT : main
spucks dead hamster : Serco : Haunting Serco space when really bored

UncleDave
UncleDave (viper)
Viper Zulu
Zoidberg
[SAW] Omicron (original)
[NPCATK] Red 1
Defense Ship 2 (after firemage gave me the name)
[AI] Arachnicon
Eagle
The Prodigal Son
Serco Fighter 0
Prometheus!
And others...

genka - blue (first char. I barely talked under that.)
n00b - blue (I thought it would eventually become ironic or something...)
[syn]n00b - blue (yarr matey)
[syn]n00b - red (someone said 'join red' so I did')

Then I had some sort of space animal for a while. I think it was 'Space Farmer'

Then there's the barons
Baron Koob - red
Baron Knob - blue (some brits seemed to think this one was funny... O.o
Baron Alantiel - gold (Celkan made this name up for me.)

lesseee...

Tennis Ball - gold
[INM][syn]n00b - red. (it was a bit of a joke.)
RedTeamCat - red. (Oh, what a pun...)
Then there was some blue char I made to act mean to people from, and a few more I can't remember.

Edit: Oi! How could I forget!
I played as 'serco monk' and 'itani monk' at some point.

Spacedog (serco)
Spacedog (NT)
Laika (serco)
Laika (itani)
Moon Dog (itani)
MoonDog (serco)
Golden Retriever (neutral capping char *g* )

and one other itani nick I don't remember...

Hoax
soy bomb
Neural Spam Bovine
UPS (I notice Airborn Express and Fed Ex haven't fessed up)
Canular
Kastin Thunderclaw (just kidding!)
Space Junk

Few others lasted less than a day...

newbie.5274872 (or something like that, forgot the exact number)
newbie
[INM] newbie
serco newbie
itani newbie
neutral newbie
sheean
VSE
Dr. Evil (hehe only a short while)
IGCJ Judge 1? (ooh I forgot that one Stick)