Mancubus

The Mancubus (plural: Mancubi) is a monster introduced in Doom II MAP07: Dead Simple, where the player is forced to fight a group of them to break through a fortified area controlled by the enemy.

Doom RPG
In Doom RPG, the mancubus appears as a class of monster. There are three variations, identified by color: This monster class is weak against rockets.
 * Behemoth (blue with red eyes)
 * Mancubus (normal colors)
 * Druj (red)

Trivia

 * It was clarified on September 2012, that the creator of the Doom series John Romero told us what the Mancubus actually says when it attacks in Doom 2. Shouting out "MENABLANAHBLAH!"
 * There are many origins to the name of the Mancubus. It is derived from two medieval demons. "Succubus", a female demon appearing in the dreams of men, and "Incubus", a male demon who would prey upon women who were alseep. "Manducare", Latin for chewing, devouring or eating and lastly "Mancus", referring to being crippled or missing limbs.