R E H Z J D N U A S V I Y T I A M H R R
E T O S N O I L F O E C N I R P E H T N
L S W E L F N E X G O G B K U T K G O C
L E K I Z W T G M F C O A H P I J I M Z
I L U J T K E T C O C V C M Z U T I M T
M E A J N E N Y A K D A M C A A D E J K
A C J I J H D I O P K E H M T N Q O N Q
C Y T D Q N O M L I P A M S F Z I P Y E
E J H V H U M Y P W T A N A D Y R A V L
M F V A A D A P K T T I X Q G Z N A C I
A C D Q C Y S U H N A A I S K L Q A Y W
G H R G Q J T R I R T S O H G E U L B O
X Z V O O F E Y T E C G C I B Z D U M O
C H P M B A R T T W X S N P R T G Y O D
L O X S D A C S E H S A I H R A Z G T E
J C R Y S H H U S B L X W K D W M C A X
O M Q N S I R L I N K P L U S H I E R E
R X O Z E K I Y B B P G O K J Z W K D B
C B L A B R S S V A X B Q I B Q B W A B
Z U W G N Y D P K A Z P V V G A M E R X


ASHES
BLUEGHOST
BOCKO
CELESTE
CHATTHREAD
CORNER
ELIWOODEXE
GAMECAMILLER
GAMEDOME
GAMERX
LINKPLUSHIE
MARIOATWLINKZEO
MOTARD
NINTENDOMASTERCHRIS
PIKACHU
SEGAMANIAC
THEPRINCEOFLIONS
TRAINSTATION
VCG

good luck

So far I have found:
Ashes, Blueghost, Linkplushie and theprinceoflions...

Edit:
Eliwoodexe, Gamedome


Edit:
Done! ^^

Found them all. You spelled ATW's username wrong. >_>

And I'm done. Took me 13 minutes, going in order.