There are two groups of “demonic” entities:
1. Lucifer and his Fallen, cast out of Heaven.
2. The disembodied spirits of the Nephilim.
During the time of King Saul the King sought the help of the Witch of Endor, who he asked to raise the spirit of the prophet Samuel. She told Saul she could not raise Samuel as he was “asleep in the arms of his Lord”. Saul told her to try anyway, and she brought up an “unclean spirit” – one of the disembodied Nephilim, houseless and unsleeping.
Lucifer and his fallen will not possess or enter a human body – we are, after all, why Lucifer rebelled in the first place. His ego and hubris could not stand the knowledge that Man was going to be created to occupy a position “higher” than the angels themselves. He and his crew look on us as little better than stinking animals, much as you or I would look upon a maggot. We would no more willingly become such a base creature, and neither will Lucifer or any of his fallen.
The Nephilim, on the other hand, desire the flesh – they were the “rock stars” of their day, worshipped as demigods, heroes and legends – or feared as monsters and villains – and they want to be flesh again. However, all they can do is to possess those who open themselves to the occult and willingly seek such a possession. case in point: the men who Jesus encountered who were possessed by evil spirits, and whom Jesus cast the spirits out of into the swine.
Your eyes do not generate “auras” or light of any type. There are no light generating structures in the eyeball.
They cannot be “born” as humans.