Playing Doom Eternal has given me a lot of inspiration for new mocs. I had a similar experience with Doom 2016, hell, I was even inspired by that game before playing it. If you scroll down far enough through my instagram, you'll be able to see the figures I built inspired by Doom.
An important detail in Doom Eternal is that the game also includes a depiction of angels as well as demons, so stay tuned for that...