The answers are here!
GhoulsCreeperhttp://www.halloween-masks.com/nosferatu_gothaw.htmPart 1: His head is taken from this mask. The mask was cut in half and mirrored just like Frostbite. He obviously has had some further photoshopping done to him, the most obvious being blackening his eyes.
Part 2: His body is a zombie body from an unknown source. I cannot find this at the time.
The
Yurei:
http://www.youtube.com/watch?v=qttT_10QGQ0This one was easy. Just ripped from this video and slightly edited.
Eyesorehttp://halloween-mask.com/dr_cyber.htmWith a little MS Paint legs, you have him.
Jitterskullhttp://halloween-mask.com/adults_skull_ru66020ih.htmBlacken the eyes, add small red ones, and their you go.
Frostbitehttp://halloween-mask.com/crypt_creature_fw8517_morris.htmThis ones a bit tricky to see. Because you can only see him from an angle, you have do a bit of photoshopping. You have cut off the left half of the picture and mirror the right. Get rid of everything but the head and finally remove some of the hood and whats left is frostbites, hood/hair.
ChokeChoke is made from a painted clay or ceramic mask.
A link is currently unavailable as the root image is unavailable.
SjasSKIN: Sjas is an image (most likely) from a website
http://Bloodlustsoftware.com. It was a skewed pic that was later un-skewed. A link is currently unavailable as the root image is unavailable.
WEAPON: Sjas's scream is taken from a popular screamer called "Whats Wrong With This Picture?"
http://www.moillusions.com/2006/03/scariest-optical-illusion.html WARNING: DO NOT CLICK YOU HAVE HEART PROBLEMS OR ISSUES WITH SCARY IMAGESHumansMarinehttp://doom.wikia.com/wiki/DoomguySKIN: If you are seriously asking this question, you deserve to be shot. The only new thing is his standing still animation.
WEAPONS: The machine gun is from the famous Alien's TC.
His hand grenade is almost definitely from here:
http://www.realm667.com/index.php?option=com_content&task=blogsection&id=30&Itemid=157&limit=20&limitstart=20His riot gun is possibly from a mod that Wild Weasel made.
CLICK THE LINK AND HIT "CTRL+F" (ON PC) or "COMMAND+F" (ON MAC) AND SEARCH "ReDoom"http://forum.drdteam.org/viewtopic.php?f=5&t=20Hunterhttp://doom.wikia.com/wiki/ClericJust as Cutmanmike said in his description of him: Simply, Parias the Cleric from HeXen:Beyond Heretic. He has been edited to have a bow as opposed to a mace.
Ghostbusterhttp://doomworld.com/gbd2/main.htmSKIN:Ghostbuster is taken from the uncompleted Ghostbusters TC. More specifically, the Peter Venkmen skin. An interesting note is gibbing (EG. Dieing from a Jitter, Frosty, or Choke) your head that bounces, is actually the Ray Stantz skin's head at an angel. This is noticeable because you can see a bit of his cigarette and you can also see he is frowning which Venkmen doesn't do, Ray does.
WEAPONS:His traps themselves are again taken from the unused GB TC. However, his proton cannon was redrawn for this project by Steve "Scuba" Browning. All of his upgrades are new sprites with one exception: the blood spreader. The very tip of the blood spreader is taken from the tip of the "Slime Cannon" from the GB TC.
FUN FACT!: A group of people are bringing back the Ghostbusters TC!I (Geonightman) am the lead mapper of said project, if you have any questions, come to the forum or ask me.
http://www.doomworld.com/vb/wads-mods/50069-ghostbusters-doom-looking-for-mappers-and-decorate-programmers/You can follow the link if your interested or if you want to download the skins, go to page 4
Engineerhttp://www.doomworld.com/idgames/index.php?id=10706SKIN: Taken from the "Base" skin of the Gothic99 deathmatch WAD.
WEAPONS: The nail's shot out by the nail gun are from various wads that have a nail gun in it of some kind, like NEO DOOM and Doom Raider. The actual nail gun is a gun called to ENFORCER. The enforcer can be found at:
http://www.realm667.com/index.php?option=com_content&task=blogsection&id=30&Itemid=157&limit=20&limitstart=20The Saw Thrower is a popular weapon in wads. It can be found here (most likely):
http://www.realm667.com/index.php?option=com_content&task=blogsection&id=30&Itemid=157&limit=20&limitstart=40As for the Steam Cannon, it was taken from a weapon called the Coal Cannon, found here:
http://realm667.com/board/viewtopic.php?f=4&t=189&start=0Cyborghttp://doom.wikia.com/wiki/ReaverSKIN: The Reaver from Strife. Nuff said.
WEAPON: His gun is from the Samus Weapons wad and the fire sound is the Arachnotron's firing sound from Doom for the Playstation. (These sounds were RE-USED for Doom 64, so technically they are NOT from Doom 64, but Doom for the Playstation.)
If you are set to female and you taunt OR you use the female bot, you will here that its voice is taken from VALVe Software's "Portal". More specifically, the turrets.
Get the Samus weapons here:
http://www.doomworld.com/gbd2/weapons/weapons/samus.htmSantahttp://www.doomworld.com/idgames/index.php?id=4904SPRITE: Taken from the "Base" skin of the Head-2-Head X-Mas WAD.
The Creepers body, Sjas's sprite, and Choke are still being looked for.
ALL STUFF FOUND BY GEONIGHTMAN! ANYONE ELSE WILL BE CREDITED HERE:

SPECIAL THANKS TO
Cutmanmike for creating Ghouls vs. Humans to begin with.
Cutmanmike (again) for helping me find the Creeper's face.
Captain Ventris for correcting my typo about the Cyborg's sprite and telling me about the Hunter being slightly edited.
Ivory for helping me find the Steam Cannon's origin.