* The [[Vagary]]'s transparent abdomen contains a malformed Mancubus fetus, leading to speculation that the Vagary is the "mother" of the Mancubi species.
* These monsters are usually accompanied by [[Cherub]]s. This has lead to some believing they are the offspring of Mancubi. This is highly unlikely, since they look and act completely differently, though it still may be possible.
* Unlike the [[Mancubus|classic variant]], the Doom 3 Mancubus no longer screams "''Mancubah!''" when firing its cannons.