Demon

Demons or devils were a broad class of malevolent beings, the term being applied directly from one universe to the next.

In one universe, demons were the dark counterparts of angels. Jenny Everywhere was, in that universe, half-devil herself. (PROSE: John Dee, Jenny Everywhere: Round One) A Cactus Demon was among the wretched souls fought off by another Jenny and her boyfriend David in a "dense universe" they were sent to by Shiva. (COMIC: Soulless Mate)

Yet another incarnation of Jenny stated that while the term "demons" could apply to "fabulous monsters", it could also metaphorically refer to the various things weighing on an individual's mind. (COMIC: Demons PSA)

Hilbert's employed Door Demons to make sure only authorised guests entered any given room, instead of conventional locks and keys. The Door Demons were disembodied until they were needed, at which point the woodwork of the door they guarded would shift into their face. (PROSE: The Grand Multiverse Hotel)