The iconography of the apotropaic severed head of Humbaba, with staring eyes, flowing beard and wild hair, is well documented from the First Babylonian dynasty, continuing into Neo-Assyrian art and dying away during the Achaemenid rule. The severed head of the monstrous Humbaba found a Greek parallel in the myth of Perseus^[10] and the similarly employed head of Medusa, which Perseus placed in his leather sack.^[11] Archaic Greek depictions of the gorgoneion render it bearded, an anomaly in the female Gorgon. Judith McKenzie detected Humbaba heads in a Nabatean tomb frieze at Petra.^[12]

https://en.m.wikipedia.org/wiki/Humbaba

There’s some potential here, if I can keep the players from snickering at his name (and sadly no, “Huwawa” doesn’t help). One of Hanbi’s get (along with Pazazu), there’s space for the demonic patron of human/humanoid reptilian crossbreeds outside of the draconic / serpentine chaos gods already discussed. On the other hand, Gilgamesh supposedly slew his non-monkey butt.

Rather than resurrecting him, maybe he’s just a model for a “Type Whatever” class of demons? Evocative setting detail, rather than a fundamental force for destruction in the universe?