https://archive.4plebs.org/x/thread/40069247/#40069247

"All the characteristics ascribed to the "evil udug" here are common features that are frequently attributed to all different kinds of ancient Mesopotamian demons: a dark shadow, absence of light surrounding it, poison, and a deafening voice. Other descriptions of the udug are not consistent with this one and often contradict it.Konstantopoulos notes that "the udug is defined by what it is not: the demon is nameless and formless, even in its early appearances."

"An incantation from the Old Babylonian Period (c. 1830 – c. 1531 BC) defines the udug as "the one who, from the beginning, was not called by name... the one who never appeared with a form."

List of the udugs:

>Mimma Lemnu (Sumerian name used for a demon and for a ritual)
Hanbi (Sumerian lord of the shadow demon called udug)
Ardat Lili (Sumerian shadow demon parly woman, partly dog and partly scorpion, devourer of children)
Vardat Lilitu (Sumerian vampire shadow demon, devourer of children-the babylonians modified her origin)
Alu/Lilu (Sumerian shadow demon without face)
Pazuzu (Sumerian king shadow demon of the wind)
Mukil Res Lemutti (Sumerian shadow demon capable of possessing people's bodies and omen of misfortune)
Namtar (Sumerian shadow demon ally with the dingir of the afterlife Ereshkigal)
Ti'u (Sumerian shadow demon of heartache)
Dimme-Kurr/Akhkhazu
Kilili (Sumerian shadow demon of the owls, ally with the dingir Inanna)
Labasù (Sumerian shadow demon disease bearer)
Abyzou (Sumerian shadow demon devourer of children)
Sathass (Sumerian shadow demon, enemy of the afterlife gods)