A Baron of hell in MAP20: Breakdown (Doom 64).

The baron of hell in Doom 64 is given a red-orange colour scheme, rather than green, which is instead used for the Hell Knight. Due to this color scheme change, the blood in its death sequence is red as opposed to green. In Doom 64 barons can also injure and infight Hell Knights and vice versa.

Monsters from Doom 64
Arachnotron | Baron of Hell | Cacodemon | Cyberdemon | Demon | Hell Knight | Imp | Lost Soul | Mancubus | Nightmare Imp | Pain Elemental | Shotgun Guy | Spectre | Zombieman | Mother Demon