Each model is made on an Epic skeleton.
Demon, BigDemon, FatDemon, LittleDemon, LongDemon - each character has a set of animations.
You can follow the links below to go to the pages with a full description of each character.
Demon preview
BigDemon preview
FatDemon preview
LittleDemon preview
LongDemon preview
All screenshots rendered in UE4.
There are a set of animations for the models.
This pack of only 5 characters. It does not include the dark demo scenes in the screenshot.