All codes listed below will affect and alter the experience of online play.
Capcom frown upon online cheating, and if you're caught you may be banned from playing online forever. ARC does not take ANY responsibility for penalties that may occur if these codes are used online. Use them at your own risk.

Resident Evil: Outbreak File #2 (NTSC)

(M) (VirusPunk)
9803001E 78D0A1F8

Universal Enable Code (VirusPunk)
F0100008 0000000E

Enable Code (VirusPunk)
F0100008 000001FD

PAL2NTSC (VirusPunk)
00112598 24120002

Y-Fix (VirusPunk)
0011295C 00000010
00112A10 00000010

X-Fix (VirusPunk)
10112960 000002A8
10112A14 000002A8

Skip FMV (VirusPunk)
00128340 24020001

Spam Addlibs Code (VirusPunk)
004C6BBC 00000001

Enable Beta Backgrounds  (VirusPunk)
00589DC8 00000000

Speed Modifier (VirusPunk)
1068DEBE 00001000

Become A Zombie After Death Offline (VirusPunk)
00684A6E 00000001
00684AF6 00000001

Skin/Costume Modifier (VirusPunk)
004C69D8 000000XX

AI Controls You (VirusPunk)
004C69C4 00000001

Extra Ammo (VirusPunk)
005D0D88 24820001

Infinite Ammo (VirusPunk)
005D0D88 24820000

Good Results (VirusPunk)
002FEEA4 05F5E0FF

Unlock NPC Ccharacters #1 (VirusPunk)
002FEEB0 88888888

Unlock NPC Ccharacters #2 (VirusPunk)
002FEEB0 80808080

Unlock NPC Ccharacters #3 (VirusPunk)
002FEEB0 01020408

Notes

NPC 00
NPC 01
NPC 02
NPC 03
NPC 04
NPC 05
NPC 06
NPC (Man w/ Face on Shirt) 07
NPC 08
NPC (Freezes) 09
NPC 0A
NPC 0B
NPC 0C
NPC 0D
NPC (Hursh with an odd face problem) 0E
NPC (Freezes) 0F
NPC (Freezes) 10
NPC 11
NPC 12
NPC 13
NPC 14
NPC (Freezes) 15
NPC 16
NPC 17
NPC (Injured Tony) 18
NPC 19
NPC 1A
NPC 1B
NPC 1C
NPC 1E
NPC (Zombie Waiter) 1F
NPC 20
NPC 21
NPC (Freezes) 22
NPC 23
NPC (Zombie Will) 24
NPC 25
NPC (Freezes) 26
NPC 27
NPC 28
NPC 29
NPC 2A
NPC 2B
NPC 2C
NPC 2D
NPC (Freezes) 2E
NPC 2F
NPC 30
NPC 31
NPC 32
NPC 33
NPC (Little Girl) 34
NPC 35
NPC 36
NPC 37
NPC 38
NPC 39
NPC (Freezes) 3A
NPC 3B
NPC 3C
NPC (Freezes) 3D
NPC (Freezes) 3E
NPC 3F
NPC 40
NPC 41
NPC 42
NPC (Freezes) 43
NPC (Freezes) 44
NPC (Freezes) 45
NPC (Bald Doctor with Goatee) 46
NPC (Freezes) 47
NPC (Freezes) 48
NPC (Cindy) 49
NPC 4A
NPC (Freezes) 4B
NPC (Freezes) 4C
NPC (Freezes) 4D
NPC (Freezes) 4E
NPC (Freezes) 4F
NPC (Freezes) 50
UBCS3 73
Zombie Doctor 1 84
Zombie Doctor 2 86
Zombie Doctor 3 88
Unknown character model 8E