“They are demons.”
No doubt about it.
You believe God created not only our galaxy, with 300 million to 40 billion earth like planets but also 100-200 billion other galaxies and put life on none of them?
There are more than one species of these entities. Some good, some bad. The good are our Angels, Watchers, Cherubim. The evil are the fallen angels, the Nephilim, the Demons. the first and seconds beasts, Abbadon, Etc.
And they have battled each other over the control of man throughout history. It is in the Bible and many other ancient works from around the world.