Succubi

Succubus (plural Succubi) are the inhabitants of the Dreamworld that was made by Derek Gilmore. They appear to be normal girls but they have qualities that differ from Human Girls. They are all very beautiful. Derek claims that they all very beautiful and it is this beauty that prevents them from dying out. It is known that when they marry they always give birth to other Succubi. They also have Vampiristic tendencies as every full moon they drink blood from their husbands for energy. Succubi live forever and they don't appear to get older (for example Lucifina looks like a teenage girl but she is in fact 1'892 years old). That could be because Derek said to Lucifina that a day in the Dreamworld is actually a month. So by that logic we know that Dreamworld has 365 months (366 months if you include leap years). So 12 Days in Dreamworld would make one whole year in the real world. So far the Succubi that have been seen and mentioned are

Lucifina (technically Sister Lucifina is Lucifina)

Phylissia

Andromeda

Araminta

Charrissia

Bellatrixa

Arabella

Miraleena

Cepheidia

Xyxancitha

Most of them are named after stars or constellations. Also the names all follow a pattern and that they end with either an "a" or "ssia".