Looking through the roster, a few credit adjustments need to be made I think.
Zombie guard, sergeant spread fire soldier, heavy uzi guy: sprite is based on the Strife player/Front Soldier/Macil uniform (sergeant commander too, but this one is properly credited to Rogue)
Sergeant mage gunner: sprite includes obvious bits of Raven Software sprites (disciple of D'Sparil hood and shoulders)
Imp abomination: the sprites originally came from
https://www.doomworld.com/idgames/graphics/impyimp so credits should be given to "D.E.A.D." or "Damien Daurio".
Lost soul terror: menu bugs out
Cacodemon aracnorb: credits are garbled
Cacodemon cacolich: I believe the sprites were made by Vader, who doesn't appear (I see a comma after the credit to Tormentor667, so it's possible he's actually listed last and not displayed because there's only two lines)
Knight Doom 3 Hell Knight: pretty sure the spelling is "Death For
etold"
Mancubus vore: the sprites were made
by NMNArchvile diabolist: "diabloist" is a typo, you know?
Also most Freedoom credits could be more precisely credited I think. Imp serpent, and cacodemon orb monster are by raymoohawk. Cyberdemon assault tripod is from Urric and edited by raymoohawk. The demon slime worm is by Fredrik.