Exhaustive list from A to Z. It appears they've taken over.
Edit: Hey, hexagon did it before I did. I do have bunnies though!
MOD NOTE: Some of these usernames contain inappropriate words, read at your own risk.
-z
Fish
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123fish
14tibbyfish
23fish
4fishfood
abihatesfish
afishrman
afrofishy
agentfisher
agentfishyb
airfish
ajfish
ajfish2
albusfish
alyssafish
andrewfish101
angelfish
angryfish
anonymousfish
aoifishy
archerfish
archerfish321
armoredfish
azurefish
bakafish
bakedfishy
bananafish
beautifuljellyfish
bertofish
bertofish1
bigfish
bigfishinthesea
bimps
billythefish
blackfish
blasterfish
blobfish
blobfish2
blobfish3
blobfishbaby
blobytheblowfish
blockfish
blowfish
bluefish6599
blueishfish
bobthefisher
bobthefishguy
bogfish
boldfish
bomberfish
bonefish
boobfish
booblefish
bradthefish
brainfish
breadfish
breadfisho
bubbafish
bubbafish123
bubbelfish
bullfish
burningoldfish
buzzerfish
cactusfish
cadaffifish
candyystarrfish
canoffish
captainfishbowlhead
carpfish
carsyfish
catfish
catfish004
catfish1
catfish132
catfish2000
catfish2001
catfish27
catfish321
catfish393
catfisheys
catfishguy
catfishprodigy
catfishprodigy5
chickenfish
circleswimmingfish
cjfisher4545
cleanerfish
clownfish
coddfish
codfish
conorfisher24
coolfish
coolfisher
coopfish
cowfish
crankyfish
crawfish
crawfish2
crawfish2003
crayfish333
crazedfish
crazyfish
crazyfishdude
creepersblowupmyfish
crexfish
crexfishy
cripplefish
curlyfish
cuttlefish
cuttlefishculler
cyborgjellyfish
dabigfish
dafishman
dancingfish
davidfisher
deadfish109
delishfish
demonfish
dermentedfishy21
derpyfish
destyfish
devalfish
devonfish
disfish
djfish
djfishy
dogfish
dogfish44
doomfish
dorkfish
doulikefish
dragonfish
drfish00oo0o55ss
drunkcatfish
eatfish1
edwardmyfish
elliefish
emikoifish
ep1cfish
epicfish
epicfish22
epicfish999
epicfishboy
ethanfish45
evilfishy111
fallingfishface
fastfish
fatalfish
fatfish
ffafish
ffishhead
ffishy
fieryfishfaeyt
fifishine
filletofish
finfish
firefish777
firejellyfish
fish
fish007
fish1
fish1002
fish12
fish123
fish1234
fish12345
fish1245
fish1331
fish2
fish2181
fish2556
fish3000
fish30y
fish34
fish3420
fish38
fish4
fish42
fish4kevin
fish4me
fish635
fish7
fish73
fish777
fish7979
fish8480
fishabba
fishai
fishapples
fisharoo
fishbacon
fishbait
fishball
fishballz
fishbashbosh
fishbate
fishbone
fishbonenl
fishbotftw
fishbowi
fishbowl
fishbowl3
fishbowlmaster13
fishboy
fishboy1992
fishboy4
fishboy778
fishboy999
fishbrain
fishbrains
fishby
fishcake
fishcake343
fishcake75
fishcakes
fishcat
fishcat22
fishcatcher101
fishcatxd
fishcod112
fishcouger
fishcowsheepman
fishcraft
fishcustard
fishdevil
fishdevilz
fishdick
fishdog
fishe
fished3474
fisheh
fisher
fisher10190
fisher17
fisher2013
fisher4209
fisher623
fisherak
fisherboy4546
fisherboy656
fisherboy6565
fisherboy88
fisherbro
fishergirl13
fishergirl656
fishermakita
fisherman
fisherman47
fishermanjames
fishermen
fisherofdreams
fishers
fisherww
fishes
fishey
fishey404
fisheyfood1234
fisheyman
fisheyman6
fisheys
fishfac3
fishface
fishfashfosh
fishfeet
fishfilet
fishfin
fishfinder
fishfish
fishfizzjizz
fishfood
fishforcod
fishfungus
fishgay
fishghiemel
fishgirl
fishgirl10
fishgonebad
fishguy
fishguy8225
fishh
fishhea
fishhead
fishheadha
fishhhhhhhhhhhhhhhhh
fishhooks
fishi
fishi1
fishie
fishies
fishii10
fishin
fishinacup
fishing
fishing123
fishing2004
fishingdude
fishingking
fishingman
fishingman12
fishingpro
fishingwithc4
fishinkid
fishisgooddude
fishken
fishking
fishlegs
fishlips
fishliver
fishloaf
fishlover
fishlunatic
fishma
fishman
fishman2
fishmann
fishmaster
fishmongler
fishmonstuntu
fishnchips
fishnchips1997
fishnchipsy
fishofpie
fishoil
fishomlat
fishonwheels
fishpaste
fishpet
fishpie
fishpoo
fishpoop
fishr00
fishrule2
fishsasadadfgsaehfkd
fishslapper
fishstar123
fishstick
fishstick123
fishsticks
fishstickz
fishstix
fishswallower12
fishtank
fishtank100
fishtheadult
fishthekid
fishthekid2
fishtittiesnigger
fishtoad
fishu
fishusg
fishvile
fishworm9
fishxd
fishy
fishy12345
fishy15
fishy4c
fishy67
fishy77
fishy7777
fishyb
fishybot
fishyboy123
fishyburger
fishycola
fishydf
fishydids
fishydude
fishyfingers
fishyfiona
fishyfish
fishyfisher
fishyfishyslapslap
fishyflakes
fishyfloat
fishyfriend21
fishyfrisky
fishygirl
fishygranny
fishyguy
fishyp
fishypeter
fishypoattowalrus
fishyputnam
fishys
fishystick
fishysua
fishytaco
fishywishy
fishywoo
fishyy
fistoffish
flapyfish
floodyfishsucks
floodyfishvaginaa
fluffyfish
flyingoldfish
flynnthefish
frankenfish
frdfish
freshfishsticks
bimps
funfisho18
funfisho8
funfisho88
funkyfish
fuuuhazelandfishbot
gangsterfish
gayfish
gephiltafish
gillfishy
gingerfish
goddlyfish
gofishy999
gogocatfish
gogofish
goldenfish
goldfish
goldfish123
goldfish15
goldfish202
goldfish223
goldfish23234
goldfishgg
goldfishman
goldfishvender
goldxfish
gonefishin
goodfish
goodfish4
goodfishman
goonfish
gorillafish100
grannyfish
greenfish
greenyfish
greyfishy
grizzlyfish
guppyfish
guppyfish002
happyfish1
happyfishe
happyturtalfish
hellofish1793
hellotinfish
heyimfish
hfish
hifish1i1i1i1i1o0o0o
hogfish
hunterfisher911
huntinfishsuger
huntingfish
hypocriticalfish
iamafish
iamnotafish
ihavefishinmypants
ijellyfish
ilikefish
imafish
imaginationfish
infinityfish
iwishmishwasafish
jacobfish12345
jamacanjellyfish
jedifishcake
jefffish
jeffishere
jellifish
jelly3fish
jellyfish
jellyfish123
jellyfish17
jellyfish1702
jellyfish25
jellyfish34
jellyfish403
jellyfish45
jellyfish7
jellyfish923
jellyfishelmo
jellyfisher
jellyfishes
jellyfishh
jellyfishvirus
jellyfishy09
jeremyfisher8
jesseblufish
jfishy
jijifisher
jimmyfish
jjfish
jjicefish
jjjjfish
joefish
jofish
jokerfish
joshfish
joshfish95
bimps
jujufisherman
jumpingclownfish
kazoodlefish
khrayfish
kidfishing
killercatfish
killfish
kingcoldrowfish
kingfish150
kingfish44
kingfisher
kingoffish
kingrainbowfish
kingrainbowfish2
kisamedafishy
kishyfishy123
kittenfish
knotfisherman
knotfisherman9
koifish
koifish711
kongfish
koyfish
krayfish
lainafish3474
lanetothefish
lauriestunafish
lazerfish
lickmyfishyanalplopp
lilyfish
lionfish46
littlefishykid
lividfish
llamafish
loganfish
loldeadfish
lolfish
lolfish321
lolfish69
lolfishimalion
lolfishz
lordfishy
lordfishy990
magofish
mahifish
malachitefish
maplefish
marcfisher
mattmonkfish
mediumfish
meepfish
melodiousfish
memfish89
meowfish
mikethefish
millyfish
mishthefish
mishthefish0o0oo000o
mishthefisho00oo0o00
mishwishfishdishnish
missfisherissexy
missstunafish
mofish
moistfishcake
monkeyfish
monkeyfish99
monkfish
montyfish
moomoofish
mrfish
mrfishie
mrfishy
mudfish
myfish
n00bgayfish
narlyfish
nemofish1
nemofish111
nemofish14
nemothefish
nerdfish
nerdfish11
nickthefish
ninjafish
ninjafish10
ninjafish123
ninjajellyfish
ninjathunfish
noobfish
obesegoldfish
octofish
offishall
olafishier
olliefish
omgyourafish
orioncatfish
overratedfishy
pandafish
parrotfish
patrickstarfish
pattiestarfish
pedobearfishes
petfish
petfish1
petfish12
picklefish
pikefishy123
pillowfish
pilotfish
pilotfishstick
pinkerfish
pinkfish
platefish
playfish
podfish
pokethefish
polakfish
porcupinefishies
profishy
psychogoldfish
pufferfish
pufferfishmage
purplefish
qwertyfish
racsofish
racsofisho
radiofish
rainbowfish
rawrfish
redfish
redfish1
redfishguy
reecefish
reefyfish
retrofishie
rjfisherjr10
rjfisherjr1009
rlofishp
robfish21
robofish
royalfishy
royalfishy1
royalfishy10
royalfishy5
runningfish
sailfish
sajfish123
samfish
samfisher
samfisher56
samfisherfr
sassystarfish
screaminggoldfish
selfishshellfish
shadowfish
sickwizardfish
silverfish
silverwaterfish
sirgoldfishy
skyfish
skylarfish
slapafishy
sleepyfisherman10
slenderfish
slipperyfish
sliverfish123
smartassfish
smellyfish
smilingfishfood
sophiefish
soulfish22
spiderfish77
spinefish
spongebobjellyfish
spontaniousfish
spyfish
starfish
starfish1
starfish1322
starfish1967
starfish20
starfish2014
starfish34
starfish3456
starfishman
starfishmans
starfishpower
starfishs
streamlinefish
stylefish
suckerfish
sup3rfish
super44fish
superepicninjafish
superfish1027
superfish606
superfish97
superfish9man
supremefishman
surprisefish
surprisefish14
sushifish
swagmesomefish
swordfish
swordfish123
swordfish238
swordfish77
tacogofish
tacticalfish
taearacodfish
tankfish
tansexualfish
tedthefish
tehepicfish
theamazingfish
theawsomefish
thebigbadjellyfish
theblowfish
thebluefish
thebluejellyfish
thecatfish
thef00glefish
thefish
thefish1994
thefishdude
thefisher
thefisherman
thefishtanker
theflyinfishey
thefooglefish
thegilfishguy1
thegloriousbreadfish
thekillerfish
thekittycawtuhfish
themoifish
thenumberonefish
theqwilfishking
thesushifish
thexafish
thingfish36
thinkerfish123
tibbyfish
toadfish
tomcatfish
totalfish
totalfish2
toxicfish
treefish12
tuckerfish
tunafish1300
tunafishman
turb0catfish
turbocatfish
turbocatfishes
turbocatfishisbad
turbocatfishpoo
turkeyfish
turtlefish
uglyfish
universefish
uscbadfish
washfish
welscatfish
whatthefish
whenacaneatsafish
wilfish
willyfishy
winterfish
wiseoldfish
wizardfish
wolfish
wolfishocean212
wyattfisher
xfishman42
xoxonafishaxoxo
xx9fish9xx
yellofish
yoloderpfish
youtubefish
youtubefishy
yoyofish2
zayfish120
zerofish
zombiefish
Bunny
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19bunny96
360bunny
abigbunny
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angelbunny
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